{"id":71678,"date":"2026-09-17T08:01:30","date_gmt":"2026-09-17T08:01:30","guid":{"rendered":"https:\/\/salesdorado.com\/uncategorized\/tools-to-test-email-deliverability\/"},"modified":"2026-09-17T08:25:11","modified_gmt":"2026-09-17T08:25:11","slug":"tools-to-test-email-deliverability","status":"publish","type":"post","link":"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/","title":{"rendered":"The Best Tools for Testing the Deliverability of Your B2B Emails"},"content":{"rendered":"<p>Does your email marketing tool show a delivery rate of over 98%? This figure simply means that your recipients\u2019 servers accepted your messages\u2014it does not mean they actually reached the inbox. In its <a href=\"https:\/\/www.validity.com\/wp-content\/uploads\/2025\/03\/2025-Benchmark-Report-FINAL.pdf\" target=\"_blank\" rel=\"noopener\">2025 email deliverability benchmark<\/a>, Validity found that<strong>one out of every six legitimate marketing emails never reached the inbox<\/strong>.<\/p>\n<p>Testing tools are supposed to reveal this discrepancy.<\/p>\n<p>The problem with B2B is that they mainly test Gmail, Outlook.com, or Yahoo email accounts, whereas your prospects read their emails in Microsoft 365 or Google Workspace\u2014and, in large companies, often behind a security gateway like Proofpoint.<\/p>\n<p>What is a perfect score on consumer email accounts really worth? And which tools truly test your prospects&#8217; email accounts?<\/p>\n<p>To find out, we analyzed the email servers of 100 companies and then took a close look at what each tool actually tests. Here you\u2019ll find a method for identifying your target\u2019s email system, the free toolkit that\u2019s often all you need, our comparison of placement tests, and the protocol to follow before each campaign.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_88 counter-hierarchy ez-toc-counter ez-toc-transparent ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Sommaire<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#testing-deliverability-what-these-tools-actually-measure\" >Testing Deliverability What These Tools Actually Measure<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#%e2%80%9cdelivered%e2%80%9d-does-not-mean-%e2%80%9creceived%e2%80%9d-in-the-inbox\" >&#8220;Delivered&#8221; does not mean &#8220;received&#8221; in the inbox<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#why-does-a-placement-test-provide-a-trend-rather-than-a-measurement\" >Why does a placement test provide a trend rather than a measurement?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#b2b-deliverability-where-do-your-prospects-emails-end-up\" >B2B Deliverability Where Do Your Prospects\u2019 Emails End Up?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#our-analysis-of-the-email-servers-of-100-companies\" >Our Analysis of the Email Servers of 100 Companies<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#microsoft-365-and-workspace-filters-configured-by-each-company\" >Microsoft 365 and Workspace Filters Configured by Each Company<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#proofpoint-mimecast-barracuda-the-overlooked-gateways-in-testing\" >Proofpoint, Mimecast, Barracuda The Overlooked Gateways in Testing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#how-to-identify-your-targets-email-service-in-two-minutes\" >How to Identify Your Target\u2019s Email Service in Two Minutes<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#test-deliverability-for-free-the-kit-thats-often-all-you-need\" >Test deliverability for free the kit that\u2019s often all you need<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#postmaster-tools-essential-but-lacks-visibility-on-google-workspace\" >Postmaster Tools Essential, but Lacks Visibility on Google Workspace<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#microsoft-snds-and-yahoo-sender-hub-useful-but-with-conditions\" >Microsoft SNDS and Yahoo Sender Hub Useful, but with Conditions<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#deliverability-testing-tools-our-comparison-for-b2b\" >Deliverability Testing Tools Our Comparison for B2B<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#1-glockapps-the-most-comprehensive-tool-for-targeting-large-accounts\" >#1 GlockApps The Most Comprehensive Tool for Targeting Large Accounts<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#2-mailreach-designed-for-business-email-accounts-and-cold-emailing\" >#2 MailReach Designed for business email accounts and cold emailing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#3-emailguard-test-volumes-designed-for-agencies\" >#3 EmailGuard Test volumes designed for agencies<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#4-unspam-the-best-value-for-email-marketing\" >#4 Unspam The Best Value for Email Marketing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#5-mailgun-optimize-placement-tests-independent-of-your-esp\" >#5 Mailgun Optimize Placement Tests Independent of Your ESP<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#6-validity-the-go-to-choice-for-large-email-senders-by-quote\" >#6 Validity The Go-To Choice for Large Email Senders, by Quote<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#what-tool-should-i-use-to-test-deliverability-based-on-my-target-audience\" >What tool should I use to test deliverability based on my target audience?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#warm-up-and-deliverability-what-the-heatwave-list-changes\" >Warm-up and Deliverability What the Heatwave List Changes<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#warm-up-and-deliverability-testing-two-different-functions\" >Warm-up and deliverability testing two different functions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#heatwave-how-to-check-that-your-domains-arent-flagged\" >Heatwave How to Check That Your Domains Aren\u2019t Flagged<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#testing-deliverability-before-a-campaign-our-protocol\" >Testing Deliverability Before a Campaign Our Protocol<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#frequently-asked-questions-about-deliverability-testing\" >Frequently Asked Questions About Deliverability Testing<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#what-is-the-best-free-tool-for-testing-deliverability\" >What is the best free tool for testing deliverability?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#is-mail-tester-reliable-for-testing-deliverability\" >Is Mail-tester reliable for testing deliverability?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#how-can-you-test-deliverability-to-microsoft-365\" >How can you test deliverability to Microsoft 365?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/tools-to-test-email-deliverability\/#does-a-placement-test-reflect-reality\" >Does a placement test reflect reality?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"testing-deliverability-what-these-tools-actually-measure\"><\/span>Testing Deliverability: What These Tools Actually Measure<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The phrase \u201ctesting deliverability\u201d actually encompasses four different questions. Most articles on the subject lump these together, and that\u2019s the primary source of confusion: an email address validator isn\u2019t a delivery test, and an anti-spam score says nothing about your reputation.<\/p>\n<div class=\"overflow-x-scroll w-full\">\n<table class=\"table-auto w-full\">\n<thead class=\"bg-gold-500\">\n<tr class=\"text-sm\">\n<th class=\"p-2 border border-slate-600\">The question<\/th>\n<th class=\"p-2 border border-slate-600\">The type of tool<\/th>\n<th class=\"p-2 border border-slate-600\">Examples<\/th>\n<th class=\"p-2 border border-slate-600\">What It Doesn&#8217;t Tell You<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"bg-white\">\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>Is my email valid?<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Test Email Analysis (Authentication, Content)<\/td>\n<td class=\"p-2 border border-slate-600\">Mail-tester, aboutmy.email, MXToolbox<\/td>\n<td class=\"p-2 border border-slate-600\">Where the email actually ends up<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>Where does it end up?<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Placement test on a seed list<\/td>\n<td class=\"p-2 border border-slate-600\">GlockApps, MailReach, Unspam, GMass tester<\/td>\n<td class=\"p-2 border border-slate-600\">The behavior of your actual recipients<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>How do email providers evaluate me?<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Email Service Provider Dashboards<\/td>\n<td class=\"p-2 border border-slate-600\">Google Postmaster Tools, Microsoft SNDS<\/td>\n<td class=\"p-2 border border-slate-600\">What&#8217;s happening in corporate email systems<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>Am I blocked somewhere?<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Blocklists and file hygiene<\/td>\n<td class=\"p-2 border border-slate-600\">Barracuda Reputation Lookup, Heatwave<\/td>\n<td class=\"p-2 border border-slate-600\">The quality of your content<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Each family of tools answers only one of these questions. <strong>No single tool covers all of them with the same level of reliability.<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"%e2%80%9cdelivered%e2%80%9d-does-not-mean-%e2%80%9creceived%e2%80%9d-in-the-inbox\"><\/span>&#8220;Delivered&#8221; does not mean &#8220;received&#8221; in the inbox<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Most email platforms calculate their deliverability rate by subtracting bounces from the number of emails sent. Validity notes that this calculation typically comes out to around 98.5%. However, the measured inbox placement rate dropped to 83.5% in 2024: 6.7% of emails ended up in the spam folder, and 9.8% were blocked or delayed en route.<\/p>\n<p>France fared better, with a 91.4% inbox delivery rate according to the same study. Nevertheless, this gap is enough to skew your profitability calculations.<\/p>\n<p><strong>A delivered email is an accepted email. Nothing more.<\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"why-does-a-placement-test-provide-a-trend-rather-than-a-measurement\"><\/span>Why does a placement test provide a trend rather than a measurement?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A placement test sends your email to what\u2019s called a <em>seed list\u2014<\/em> a panel of test mailboxes managed by the tool across various providers. The tool then tracks where each copy landed.<\/p>\n<p>The limitation is structural. These accounts have no history with you: they never open anything and never reply. Gmail and Microsoft, on the other hand, tailor their filtering to each recipient\u2019s behavior. The EmailToolTester comparison tool, which uses GlockApps for its own testing, acknowledges this: an email sent to a seed list behaves like a cold email, so your actual deliverability is likely better than the result shown.<\/p>\n<p>Google, for its part, notes in the <a href=\"https:\/\/support.google.com\/mail\/answer\/14668346\" target=\"_blank\" rel=\"noopener\">Postmaster Tools dashboard documentation<\/a> that spam reports from third-party tools generally differ from its own data.<\/p>\n<p>Does that mean we should do away with seed lists? No. They remain the best way to identify issues before a mailing, and Validity\u2019s benchmark itself is based on this type of data. But a single test doesn\u2019t prove much. <strong>Compare your results over time, not from one tool to another.<\/strong><\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-71644\" src=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/Mail-tester-scaled.png\" alt=\"\" width=\"2048\" height=\"1084\" srcset=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/Mail-tester-scaled.png 2048w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/Mail-tester-300x159.png 300w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/Mail-tester-1024x542.png 1024w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/Mail-tester-768x407.png 768w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/Mail-tester-1536x813.png 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/p>\n<div class=\"blocTips danger-light\"><i class=\"fa fa-exclamation-triangle\"><\/i><span class=\"title is-5\">A 10\/10 score on Mail-tester doesn&#8217;t guarantee anything<\/span><br \/>\nA perfect score proves that your email is technically sound: authentication is in place, and the content shows no suspicious signs. It doesn&#8217;t indicate where Gmail, Microsoft 365, or a corporate gateway will classify it. Treat it as a prerequisite, never as a final verdict.<\/div>\n\n<h2><span class=\"ez-toc-section\" id=\"b2b-deliverability-where-do-your-prospects-emails-end-up\"><\/span>B2B Deliverability: Where Do Your Prospects\u2019 Emails End Up?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In B2B, deliverability plays out on a different playing field. Validity highlights this point: in addition to filtering their email systems, many companies entrust their email protection to a specialized service provider. To gauge the significance of this, we looked at where emails from 100 companies actually end up.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"our-analysis-of-the-email-servers-of-100-companies\"><\/span>Our Analysis of the Email Servers of 100 Companies<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"overflow-x-scroll w-full\">\n<table class=\"table-auto w-full\">\n<thead class=\"bg-gold-500\">\n<tr class=\"text-sm\">\n<th class=\"p-2 border border-slate-600\">Where do emails end up?<\/th>\n<th class=\"p-2 border border-slate-600\">60 major companies listed on the Paris Stock Exchange<\/th>\n<th class=\"p-2 border border-slate-600\">40 digital companies<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"bg-white\">\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">Directly in Microsoft 365<\/td>\n<td class=\"p-2 border border-slate-600\">21 (35%)<\/td>\n<td class=\"p-2 border border-slate-600\">1 (2.5%)<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">Directly in Google Workspace<\/td>\n<td class=\"p-2 border border-slate-600\">4 (7%)<\/td>\n<td class=\"p-2 border border-slate-600\">37 (92.5%)<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>First, via a safety bridge<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\"><strong>26 (43%)<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">1 (2.5%)<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">including Proofpoint<\/td>\n<td class=\"p-2 border border-slate-600\">17<\/td>\n<td class=\"p-2 border border-slate-600\">1<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">including Mimecast<\/td>\n<td class=\"p-2 border border-slate-600\">5<\/td>\n<td class=\"p-2 border border-slate-600\">0<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">including Cisco and Trend Micro<\/td>\n<td class=\"p-2 border border-slate-600\">4<\/td>\n<td class=\"p-2 border border-slate-600\">0<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">Internal servers or other service providers<\/td>\n<td class=\"p-2 border border-slate-600\">9 (15%)<\/td>\n<td class=\"p-2 border border-slate-600\">1 (2.5%)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"blocTips info-light\"><i class=\"fa fa-info-circle\"><\/i><span class=\"title is-5\">Our Method<\/span><br \/>\nOn September 16, 2026, we analyzed the MX records (the servers that receive emails for a domain) of 100 domains: 60 large companies listed on the Paris Stock Exchange, most of which are members of the CAC 40 or SBF 120, and 40 digital companies founded in France (scale-ups, software publishers, fintechs, and marketplaces). The MX records show only the first link in the chain: a gateway filters emails before forwarding them to the company\u2019s email system. The sample does not include SMEs and does not claim to be representative.<\/div>\n<p>Two profiles, two realities:<\/p>\n<ul>\n<li><strong>Among large companies<\/strong>, 43% first route emails through a security gateway, with Proofpoint far ahead (17 out of 60 companies). Only 21 receive their emails directly in Microsoft 365. The remaining nine use their own servers or a less common provider (primarily banks and companies in the aerospace and defense sectors).<\/li>\n<li><strong>In the digital sector<\/strong>, the landscape is nearly uniform: 37 out of 40 companies use Google Workspace.<\/li>\n<\/ul>\n<p>Takeaway: A test conducted on consumer Gmail accounts says nothing about the first scenario and tells only part of the story regarding the second.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"microsoft-365-and-workspace-filters-configured-by-each-company\"><\/span>Microsoft 365 and Workspace: Filters Configured by Each Company<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Of the emails that Validity\u2019s clients send to hosted business email accounts, 61.4% go to Office 365 and 35.4% to Google. Their filtering is similar to that of their consumer versions. One key difference makes all the difference: <strong>each administrator can add their own rules<\/strong>, which are often stricter than the default settings.<\/p>\n<p>The same email can therefore be delivered by Gmail but blocked by a client whose IT team has tightened its settings. MailReach acknowledges this:<strong> a message may reach the inbox 100% of the time on work email accounts but end up in the spam folder on personal accounts<\/strong>. The reverse is just as likely.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"proofpoint-mimecast-barracuda-the-overlooked-gateways-in-testing\"><\/span>Proofpoint, Mimecast, Barracuda: The Overlooked Gateways in Testing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A security gateway adds a second layer of protection, positioned before the company\u2019s email system. According to Validity, four vendors handle more than 90% of the traffic that its customers send to this type of solution:<\/p>\n<ul>\n<li><strong>Proofpoint<\/strong>: 50.4% of traffic on its own<\/li>\n<li><strong>Mimecast<\/strong>: 21.1%<\/li>\n<li><strong>Cisco<\/strong>: 12.1%<\/li>\n<li><strong>Barracuda<\/strong>: 10%, with only 77.2% of emails delivered to the inbox and 22.8% blocked or delayed<\/li>\n<\/ul>\n<p>Validity also notes that many French ISPs rely on Vade for filtering. This is something to keep in mind if your list contains addresses from these providers.<\/p>\n<p>Very few testing tools simulate these gateways. Among those we\u2019ve reviewed, GlockApps routes your emails through Proofpoint and Barracuda filters, and the free GMass tester includes Google Workspace accounts protected by Barracuda, Mimecast, or Sophos.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-71652\" src=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/GMass-scaled.png\" alt=\"\" width=\"2048\" height=\"1069\" srcset=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/GMass-scaled.png 2048w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/GMass-300x157.png 300w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/GMass-1024x535.png 1024w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/GMass-768x401.png 768w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/GMass-1536x802.png 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"how-to-identify-your-targets-email-service-in-two-minutes\"><\/span>How to Identify Your Target\u2019s Email Service in Two Minutes<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No paid tool required.<\/p>\n<p>The method consists of four steps:<\/p>\n<ol>\n<li>Select 20 to 50 domains that are representative of your file.<\/li>\n<li>Enter each one into a free MX lookup tool, such as the \u201cMX Lookup\u201d feature <a href=\"https:\/\/mxtoolbox.com\/SuperTool.aspx\" target=\"_blank\" rel=\"noopener\">in MXToolbox\u2019s SuperTool<\/a>.<\/li>\n<li>Compare the server displayed with the table below.<\/li>\n<li>Calculate the percentage for each environment: this will guide your choice of testing tool.<\/li>\n<\/ol>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-71632\" src=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/mxtoolbox-salesdorado-scaled.png\" alt=\"\" width=\"2048\" height=\"908\" srcset=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/mxtoolbox-salesdorado-scaled.png 2048w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/mxtoolbox-salesdorado-300x133.png 300w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/mxtoolbox-salesdorado-1024x454.png 1024w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/mxtoolbox-salesdorado-768x340.png 768w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/mxtoolbox-salesdorado-1536x681.png 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/p>\n<div class=\"overflow-x-scroll w-full\">\n<table class=\"table-auto w-full\">\n<thead class=\"bg-gold-500\">\n<tr class=\"text-sm\">\n<th class=\"p-2 border border-slate-600\">The MX server contains<\/th>\n<th class=\"p-2 border border-slate-600\">The email arrives at<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"bg-white\">\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">mail.protection.outlook.com or mx.microsoft<\/td>\n<td class=\"p-2 border border-slate-600\">Microsoft 365<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">aspmx.l.google.com, googlemail.com, or smtp.google.com<\/td>\n<td class=\"p-2 border border-slate-600\">Google Workspace<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">pphosted.com<\/td>\n<td class=\"p-2 border border-slate-600\">Proofpoint<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">mimecast.com<\/td>\n<td class=\"p-2 border border-slate-600\">Mimecast<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">iphmx.com<\/td>\n<td class=\"p-2 border border-slate-600\">Cisco Secure Email<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">barracudanetworks.com<\/td>\n<td class=\"p-2 border border-slate-600\">Barracuda<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">trendmicro<\/td>\n<td class=\"p-2 border border-slate-600\">Trend Micro<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">sophos.com<\/td>\n<td class=\"p-2 border border-slate-600\">Sophos<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">hornetsecurity.com or antispameurope.com<\/td>\n<td class=\"p-2 border border-slate-600\">Hornetsecurity or Vade<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">mail.ovh.net<\/td>\n<td class=\"p-2 border border-slate-600\">OVHcloud<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">gandi.net<\/td>\n<td class=\"p-2 border border-slate-600\">Gandi<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<div class=\"blocTips primary-light\"><i class=\"fa fa-lightbulb-o\"><\/i><span class=\"title is-5\">Salesdorado&#8217;s advice<\/span><br \/>\n: Tailor your tests to your contact list. If 40% of your target accounts use Proofpoint, your delivery test should include this filter, supplemented by an actual send to a few clients who have it enabled. A good score on consumer email accounts will never make up for a blind spot in your primary target audience.<\/div>\n<h2><span class=\"ez-toc-section\" id=\"test-deliverability-for-free-the-kit-thats-often-all-you-need\"><\/span>Test deliverability for free: the kit that\u2019s often all you need<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Most of the checks are free. However, you still need to set up the tools. Badsender, which supported more than twenty organizations in 2025, notes in its <a href=\"https:\/\/www.badsender.com\/2026\/01\/05\/10-recommandations-delivrabilite2025\/\" target=\"_blank\" rel=\"noopener\">summary of deliverability recommendations from its 2025 projects<\/a> that several of these engagements began with the implementation of Google Postmaster Tools and Microsoft SNDS.<\/p>\n<p>These tools simply weren&#8217;t configured.<\/p>\n<div class=\"overflow-x-scroll w-full\">\n<table class=\"table-auto w-full\">\n<thead class=\"bg-gold-500\">\n<tr class=\"text-sm\">\n<th class=\"p-2 border border-slate-600\">Free Tool<\/th>\n<th class=\"p-2 border border-slate-600\">What it teaches you<\/th>\n<th class=\"p-2 border border-slate-600\">What it doesn&#8217;t see<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"bg-white\">\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><a href=\"https:\/\/www.mail-tester.com\/\" target=\"_blank\" rel=\"noopener\">Mail-tester<\/a><\/td>\n<td class=\"p-2 border border-slate-600\">A score out of 10 that summarizes authentication and content, with three free tests per day<\/td>\n<td class=\"p-2 border border-slate-600\">Rankings by provider<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><a href=\"https:\/\/aboutmy.email\/\" target=\"_blank\" rel=\"noopener\">aboutmy.email<\/a><\/td>\n<td class=\"p-2 border border-slate-600\">A detailed report on authentication and compliance with best practices<\/td>\n<td class=\"p-2 border border-slate-600\">Placement and reputation<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">MXToolbox<\/td>\n<td class=\"p-2 border border-slate-600\">Your DNS records (SPF, DKIM, DMARC) and your blacklist status<\/td>\n<td class=\"p-2 border border-slate-600\">The content of your emails<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><a href=\"https:\/\/www.barracudacentral.org\/lookups\" target=\"_blank\" rel=\"noopener\">Barracuda Reputation Lookup<\/a><\/td>\n<td class=\"p-2 border border-slate-600\">If your IP address is on Barracuda&#8217;s blocklist<\/td>\n<td class=\"p-2 border border-slate-600\">Other gateways<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">Heatwave (Validity)<\/td>\n<td class=\"p-2 border border-slate-600\">If your domain is flagged for artificial warm-up<\/td>\n<td class=\"p-2 border border-slate-600\">Everything else: this is a blocklist, not a test<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><a href=\"https:\/\/www.gmass.co\/inbox\" target=\"_blank\" rel=\"noopener\">GMass Tester<\/a><\/td>\n<td class=\"p-2 border border-slate-600\">Deployment across 15 Google mailboxes, including Google Workspace accounts filtered by gateways such as Barracuda or Mimecast<\/td>\n<td class=\"p-2 border border-slate-600\">Microsoft 365 and Proofpoint<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\">Google Postmaster Tools<\/td>\n<td class=\"p-2 border border-slate-600\">Complaints, Compliance, and Delivery Errors in Gmail<\/td>\n<td class=\"p-2 border border-slate-600\">Recipients on Google Workspace<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-71648\" src=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/AboutMy.email_-scaled.png\" alt=\"\" width=\"2048\" height=\"1018\" srcset=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/AboutMy.email_-scaled.png 2048w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/AboutMy.email_-300x149.png 300w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/AboutMy.email_-1024x509.png 1024w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/AboutMy.email_-768x382.png 768w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/AboutMy.email_-1536x764.png 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/p>\n<p>As for paid tools, most providers offer free trials: two credits at GlockApps, three placement tests per month at Unspam, three trials per 24 hours on the MailReach test, and ten tests with anti-spam filters at EmailGuard. <a href=\"\/go\/zerobounce\" target=\"_blank\" rel=\"noopener sponsored\">ZeroBounce<\/a>, which we\u2019ve <a href=\"https:\/\/salesdorado.com\/en\/automation\/review-zerobounce\/\">reviewed in detail<\/a>, has added a free delivery test to its email address verification service.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"postmaster-tools-essential-but-lacks-visibility-on-google-workspace\"><\/span>Postmaster Tools: Essential, but Lacks Visibility on Google Workspace<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/postmaster.google.com\/v2\/\" target=\"_blank\" rel=\"noopener\">Postmaster Tools<\/a> remains the only direct access to Gmail data regarding your mailings, including complaints and delivery errors. Version 2 adds a sender compliance dashboard and a diagnostic tool (\u201cDeliverability Analysis\u201d) that provides recommendations when your volume is too low, your messages fail to deliver, you exceed the complaint threshold, or your recipients aren\u2019t engaging with your emails.<\/p>\n<p>Four game-changers in B2B:<\/p>\n<ol>\n<li><strong>It only covers consumer Gmail.<\/strong> The tables cover emails sent to personal Gmail accounts, and the <a href=\"https:\/\/support.google.com\/mail\/answer\/14229414\" target=\"_blank\" rel=\"noopener\">FAQ on Gmail sender policies<\/a> specifies that these policies do not apply to messages intended for Google Workspace. If you\u2019re reaching out to scale-ups, the tool provides no insight into the majority of your mailings.<\/li>\n<li><strong>Reputation tables are being phased out.<\/strong> Google announced on its <a href=\"https:\/\/support.google.com\/mail\/answer\/16594218\" target=\"_blank\" rel=\"noopener\">page dedicated to the discontinuation of the old Postmaster Tools interface<\/a> that it is removing domain and IP reputation tables, which were deemed difficult to act upon and sometimes misleading.<\/li>\n<li><strong>A very low complaint rate isn&#8217;t always reassuring.<\/strong> Google explains that it may mean Gmail is already classifying a large portion of your messages as spam, where no one reports them.<\/li>\n<li><strong>The thresholds are strict.<\/strong> Stay below 0.10% complaints and never reach 0.30%. Since November 2025, Gmail has been enforcing its rules more strictly, with temporary or permanent blocks. If you send more than about 5,000 messages per day to Gmail, you\u2019ll be classified as a \u201cbulk sender\u201d for good.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"microsoft-snds-and-yahoo-sender-hub-useful-but-with-conditions\"><\/span>Microsoft SNDS and Yahoo Sender Hub: Useful, but with Conditions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>SNDS is Microsoft\u2019s equivalent, with two limitations. It operates based on IP addresses and applies only to consumer email accounts\u2014Outlook.com and Hotmail. As Al Iverson points out on <a href=\"https:\/\/www.spamresource.com\/2022\/09\/delivterms-microsoft-smart-network-data.html\" target=\"_blank\" rel=\"noopener\">Spam Resource<\/a>, it\u2019s therefore only useful with a dedicated IP address: on an IP shared by your ESP, data from all senders gets mixed together. He adds that a green status doesn\u2019t prevent emails from ending up in the spam folder on Outlook.com.<\/p>\n<p>Yahoo Sender Hub, launched in 2024, plays a similar role for Yahoo and AOL.<\/p>\n<div class=\"blocTips danger-light\"><i class=\"fa fa-exclamation-triangle\"><\/i><span class=\"title is-5\">Microsoft Rejects Non-Compliant Emails<\/span><br \/>\nStarting in May 2025, Outlook.com will require SPF, DKIM, and DMARC for domains that send more than 5,000 emails per day to its consumer mailboxes, as detailed <a href=\"https:\/\/techcommunity.microsoft.com\/blog\/microsoftdefenderforoffice365blog\/strengthening-email-ecosystem-outlook%E2%80%99s-new-requirements-for-high%E2%80%90volume-senders\/4399730\" target=\"_blank\" rel=\"noopener\">in Microsoft\u2019s announcement regarding high-volume senders<\/a>. Non-compliant messages are rejected with the error \u201c550 5.7.515.\u201d If you see this code in your bounce reports, start here.<\/div>\n<h2><span class=\"ez-toc-section\" id=\"deliverability-testing-tools-our-comparison-for-b2b\"><\/span>Deliverability Testing Tools: Our Comparison for B2B<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Six tools stand out for B2B use<\/strong>. We evaluated them based on one absolutely key criterion: real-world professional environments that have been thoroughly tested.<\/p>\n<div class=\"overflow-x-scroll w-full\">\n<table class=\"table-auto w-full\">\n<thead class=\"bg-gold-500\">\n<tr class=\"text-sm\">\n<th class=\"p-2 border border-slate-600\">Tool<\/th>\n<th class=\"p-2 border border-slate-600\">Tested B2B Environments<\/th>\n<th class=\"p-2 border border-slate-600\">Starting price<\/th>\n<th class=\"p-2 border border-slate-600\">Free plan<\/th>\n<th class=\"p-2 border border-slate-600\">Ideal for<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"bg-white\">\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>#1 GlockApps<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Office 365, G Suite, Microsoft EOP filters, Proofpoint, and Barracuda<\/td>\n<td class=\"p-2 border border-slate-600\">$59\/month with an annual commitment<\/td>\n<td class=\"p-2 border border-slate-600\">2 trial credits<\/td>\n<td class=\"p-2 border border-slate-600\">Target large enterprises<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>#2 MailReach<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Google Workspace and Office 365 email account network<\/td>\n<td class=\"p-2 border border-slate-600\">$19.50 per mailbox\/month, 20 credits included<\/td>\n<td class=\"p-2 border border-slate-600\">3 tests per 24 hours<\/td>\n<td class=\"p-2 border border-slate-600\">Cold email<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>#3 EmailGuard<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Filter list not published<\/td>\n<td class=\"p-2 border border-slate-600\">$49\/month for 300 tests<\/td>\n<td class=\"p-2 border border-slate-600\">10 tests with anti-spam filters<\/td>\n<td class=\"p-2 border border-slate-600\">Multi-domain agencies<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>#4 Unspam<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Mainly consumer email services<\/td>\n<td class=\"p-2 border border-slate-600\">$9\/month<\/td>\n<td class=\"p-2 border border-slate-600\">3 placement tests per month<\/td>\n<td class=\"p-2 border border-slate-600\">Email marketing<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>#5 Mailgun Optimize<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">List of providers to check<\/td>\n<td class=\"p-2 border border-slate-600\">$49\/month for 25 tests<\/td>\n<td class=\"p-2 border border-slate-600\">No<\/td>\n<td class=\"p-2 border border-slate-600\">Technical teams<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>#6 Validity<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Professional hosting providers and filtering gateways<\/td>\n<td class=\"p-2 border border-slate-600\">By quote<\/td>\n<td class=\"p-2 border border-slate-600\">No<\/td>\n<td class=\"p-2 border border-slate-600\">Large senders<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"1-glockapps-the-most-comprehensive-tool-for-targeting-large-accounts\"><\/span>#1 GlockApps: The Most Comprehensive Tool for Targeting Large Accounts<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>GlockApps is one of the most frequently cited email delivery testing tools, and EmailToolTester uses it for its own studies. Its strength in B2B lies in its targets: Exchange (Office 365) and G Suite are among its test mailboxes, and every email passes through five filters, including Microsoft EOP, Proofpoint, and Barracuda.<\/p>\n<div class=\"columns\">\n<div class=\"column is-one-half\">\n<ul class=\"points-forts\">\n<li>Tests on Office 365 and G Suite, using leading enterprise filters<\/li>\n<li>Monitoring blacklists and DMARC reports in a single tool<\/li>\n<li>API available starting with the free plan; integration with Postmaster Tools on higher-tier plans<\/li>\n<li>With the Enterprise plan, add your own addresses to the seed list\u2014for example, a client\u2019s address protected by Proofpoint<\/li>\n<\/ul>\n<\/div>\n<div class=\"column is-one-half\">\n<ul class=\"points-faibles\">\n<li>Only one French internet service provider was tested: Laposte.net<\/li>\n<li>About 30 tests per month on the Essential plan, with one credit used for each test<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-71664\" src=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/glock-apps.png\" alt=\"\" width=\"2048\" height=\"893\" srcset=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/glock-apps.png 2048w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/glock-apps-300x131.png 300w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/glock-apps-1024x447.png 1024w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/glock-apps-768x335.png 768w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/glock-apps-1536x670.png 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/p>\n<p><strong>Pricing:<\/strong> Free plan with two credits, then the Essential plan at $59 per month with an annual commitment ($708 per year), or $85 without a commitment.<\/p>\n<div class=\"blocTips info-light\"><span class=\"title is-5\">Try GlockApps for free<\/span> at<br \/>\n. GlockApps&#8217; free offer includes two trial credits\u2014enough to test your positioning on Office 365 and G Suite before a major campaign.\n<div class=\"buttons\"><a class=\"button is-info is-normal\" title=\"GlockApps\" href=\"https:\/\/glockapps.com\/spam-testing\/\" target=\"_blank\" rel=\"noopener\">Try GlockApps<\/a><\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"2-mailreach-designed-for-business-email-accounts-and-cold-emailing\"><\/span>#2 MailReach: Designed for business email accounts and cold emailing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>MailReach combines two products: a warm-up tool and a placement test. Its network is based on Google Workspace and Office 365 email accounts\u2014the two environments that matter most in B2B. This is its main advantage over tools focused on consumer email services.<\/p>\n<ul>\n<li><strong>Ideal if<\/strong> you\u2019re sending out emails from multiple mailboxes and want to review each campaign before launching it.<\/li>\n<li><strong>Less suitable if<\/strong> your target accounts are protected by gateways: the provider does not highlight testing on Proofpoint or Mimecast.<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-71660\" src=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/MailReach-scaled.png\" alt=\"\" width=\"2048\" height=\"964\" srcset=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/MailReach-scaled.png 2048w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/MailReach-300x141.png 300w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/MailReach-1024x482.png 1024w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/MailReach-768x362.png 768w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/MailReach-1536x723.png 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/p>\n<p><strong>Pricing:<\/strong> The test is free for up to three trials per 24 hours. The All-in-One offer, including the warm-up, costs $25 per box per month with 20 test credits. Credits can also be purchased separately. Its warm-up module operates on a different model, which we will discuss later.<\/p>\n<div class=\"blocTips info-light\"><span class=\"title is-5\">Try MailReach for free<\/span><br \/>\nMailReach&#8217;s placement test is free, limited to three attempts per 24 hours, on a network of Google Workspace and Office 365 mailboxes.\n<div class=\"buttons\"><a class=\"button is-info is-normal\" title=\"MailReach\" href=\"https:\/\/www.mailreach.co\/email-spam-test\" target=\"_blank\" rel=\"noopener\">Run a MailReach test<\/a><\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"3-emailguard-test-volumes-designed-for-agencies\"><\/span>#3 EmailGuard: Test volumes designed for agencies<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>EmailGuard is designed for teams that manage a large number of sending domains. The tool combines one-time or scheduled deliverability tests with blacklist monitoring and DMARC reports.<\/p>\n<p>Its appeal lies mainly in its size:<\/p>\n<ul class=\"icon-check\">\n<li>Free offer: one domain, ten tests with anti-spam filters, and unlimited DMARC monitoring<\/li>\n<li>Pro, at $49 per month: 300 deliverability tests, 25 domains, and 100 sender accounts<\/li>\n<li>Business, $129 per month: 500 deliverability tests<\/li>\n<li>Agency, $199 per month: 1,500 deliverability tests<\/li>\n<\/ul>\n<p>One limitation: We couldn\u2019t find a public list of the filters used. During the trial, make sure your target environments are fully covered.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-71668\" src=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/email-guard.png\" alt=\"\" width=\"2048\" height=\"946\" srcset=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/email-guard.png 2048w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/email-guard-300x139.png 300w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/email-guard-1024x473.png 1024w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/email-guard-768x355.png 768w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/email-guard-1536x710.png 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/p>\n<div class=\"blocTips info-light\"><span class=\"title is-5\">Try EmailGuard for free<\/span><br \/>\nThe EmailGuard free plan covers one domain, with ten email scans and unlimited DMARC monitoring.\n<div class=\"buttons\"><a class=\"button is-info is-normal\" title=\"EmailGuard\" href=\"https:\/\/emailguard.io\/\" target=\"_blank\" rel=\"noopener\">Create an EmailGuard account<\/a><\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"4-unspam-the-best-value-for-email-marketing\"><\/span>#4 Unspam: The Best Value for Email Marketing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Unspam combines an anti-spam score, deliverability testing, email client previews, and an AI-generated heat map all in a single subscription. It\u2019s the most affordable tool in our selection: free for up to 10 placement tests per month and $19.30 for 50 tests.<\/p>\n<p>Its limitation in the B2B sector lies in its supported destinations: Gmail, Outlook, Yahoo, Zoho, ProtonMail, AOL, GMX, and Amazon WorkMail. There is no indication that it has been tested with Microsoft 365 in a corporate environment or with a gateway. For a newsletter or a mixed email list, it\u2019s an excellent choice. For prospecting large accounts, however, it\u2019s not sufficient.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-71656\" src=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/unspam.png\" alt=\"\" width=\"2048\" height=\"978\" srcset=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/unspam.png 2048w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/unspam-300x143.png 300w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/unspam-1024x489.png 1024w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/unspam-768x367.png 768w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/unspam-1536x734.png 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/p>\n<div class=\"blocTips info-light\"><span class=\"title is-5\">Try Unspam for free<\/span><br \/>\nUnspam&#8217;s free offer includes three placement tests and ten anti-spam scans, renewed each month.\n<div class=\"buttons\"><a class=\"button is-info is-normal\" title=\"Unspam\" href=\"https:\/\/unspam.email\/\" target=\"_blank\" rel=\"noopener\">Try Unspam<\/a><\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"5-mailgun-optimize-placement-tests-independent-of-your-esp\"><\/span>#5 Mailgun Optimize: Placement Tests Independent of Your ESP<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Mailgun, which is owned by Sinch, is best known as an email delivery service. However, its Optimize suite can be used with any ESP. The Pilot plan starts at $49 per month for 25 deliverability tests, including address validation and email previews. The Starter plan increases to 50 tests for $99 and adds blacklist monitoring as well as integration with Postmaster Tools.<\/p>\n<p>Its tests do not distinguish between Gmail&#8217;s &#8220;Main&#8221; tab and &#8220;Promotions&#8221; tab. A minor detail for a transactional email. A real limitation for a newsletter.<\/p>\n<div class=\"blocTips info-light\"><span class=\"title is-5\">Learn about Mailgun Optimize<\/span><br \/>\nThe Mailgun Optimize suite works with any email sending tool, starting at $49 per month.\n<div class=\"buttons\"><a class=\"button is-info is-normal\" title=\"Mailgun Optimize\" href=\"https:\/\/www.mailgun.com\/products\/optimize\/\" target=\"_blank\" rel=\"noopener\">See Mailgun Optimize<\/a><\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"6-validity-the-go-to-choice-for-large-email-senders-by-quote\"><\/span>#6 Validity: The Go-To Choice for Large Email Senders, by Quote<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Validity is the leading provider for large email senders. Its seed lists cover hundreds of email providers and anti-spam filters worldwide, and its annual benchmark is based on this data.<\/p>\n<p>For B2B, EmailToolTester highlights two key strengths of its Everest platform:<\/p>\n<ul>\n<li>Tests can include professional email service providers and filtering tools.<\/li>\n<li>A dedicated feature weights the tests based on the email providers present in your list\u2014exactly the approach we advocate in this article.<\/li>\n<\/ul>\n<p>Validity also counts Orange among its partners, a useful point for shipments to the French market.<\/p>\n<p>The price, however, is no longer public. Everest&#8217;s pricing page now redirects to a sales form, and Validity groups its offers, including Litmus, on its Engage platform. There are no free offers.<\/p>\n<div class=\"blocTips info-light\"><span class=\"title is-5\">Discover Validity<\/span><br \/>\nValidity is aimed at large shippers and operates on a quote basis: schedule a demonstration with their sales team.\n<div class=\"buttons\"><a class=\"button is-info is-normal\" title=\"Validity\" href=\"https:\/\/www.validity.com\/\" target=\"_blank\" rel=\"noopener\">Contact Validity<\/a><\/div>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"what-tool-should-i-use-to-test-deliverability-based-on-my-target-audience\"><\/span>What tool should I use to test deliverability based on my target audience?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The right tool depends less on your budget than on your recipients&#8217; email providers.<\/p>\n<p>Here are our recommendations, broken down by scenario.<\/p>\n<div class=\"overflow-x-scroll w-full\">\n<table class=\"table-auto w-full\">\n<thead class=\"bg-gold-500\">\n<tr class=\"text-sm\">\n<th class=\"p-2 border border-slate-600\">Your target audience or use case<\/th>\n<th class=\"p-2 border border-slate-600\">Top priorities to test<\/th>\n<th class=\"p-2 border border-slate-600\">Our selection<\/th>\n<th class=\"p-2 border border-slate-600\">Budget<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"bg-white\">\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>Scale-ups and SaaS providers<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Google Workspace<\/td>\n<td class=\"p-2 border border-slate-600\">GMass Tester, MailReach<\/td>\n<td class=\"p-2 border border-slate-600\">Free to $19.50 per sending account<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>SMEs<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Allocation to be determined using the MX method<\/td>\n<td class=\"p-2 border border-slate-600\">GlockApps (free plan, then Essential)<\/td>\n<td class=\"p-2 border border-slate-600\">Free to $59 per month<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>Large Accounts<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Gateways (Proofpoint, Mimecast) and Microsoft 365<\/td>\n<td class=\"p-2 border border-slate-600\">GlockApps or Validity, plus an actual email campaign to equipped contacts<\/td>\n<td class=\"p-2 border border-slate-600\">$59 per month or upon request<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>Multi-domain cold email<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Each outbox, continuously<\/td>\n<td class=\"p-2 border border-slate-600\">EmailGuard, MailReach, and SmartDelivery for Smartlead users<\/td>\n<td class=\"p-2 border border-slate-600\">Starting at $19.50 per mailbox or $49 per month<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>Newsletters and Email Marketing<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Consumer email services and French internet service providers<\/td>\n<td class=\"p-2 border border-slate-600\">Unspam, GlockApps<\/td>\n<td class=\"p-2 border border-slate-600\">Starting at $9 per month<\/td>\n<\/tr>\n<tr class=\"text-sm font-light\">\n<td class=\"p-2 border border-slate-600\"><strong>Transactional emails<\/strong><\/td>\n<td class=\"p-2 border border-slate-600\">Technical Compliance and Reputation<\/td>\n<td class=\"p-2 border border-slate-600\">Mail-tester, aboutmy.email, Postmaster Tools, Mailgun Optimize<\/td>\n<td class=\"p-2 border border-slate-600\">Free to $49 per month<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>If you\u2019re prospecting with Smartlead, its paid feature, SmartDelivery, adds placement tests directly within the tool (see our <a href=\"https:\/\/salesdorado.com\/en\/sdr-tools\/smartlead-review\/\">review of Smartlead<\/a>). To compare the email marketing platforms themselves, check out our selection<a href=\"https:\/\/salesdorado.com\/en\/cold-email\/cold-email-tools\/\">of cold-emailing tools<\/a> and our comparison of <a href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/email-marketing-software\/\">email marketing software<\/a>, which includes <a href=\"https:\/\/salesdorado.com\/en\/b2b-marketing\/marketing-automation-software\/brevo-review\/\">Brevo<\/a>.<\/p>\n<p>When it comes to newsletters, neither GlockApps nor Unspam tests Orange or SFR. So keep an eye on these recipients in your router\u2019s statistics, as recommended by Badsender. If you\u2019re more concerned with how your emails appear than where they land, consider using <a href=\"https:\/\/salesdorado.com\/en\/marketing-b2b\/10-tools-to-test-your-email-campaigns\/\">tools designed to test how your emails render<\/a>.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"warm-up-and-deliverability-what-the-heatwave-list-changes\"><\/span>Warm-up and Deliverability: What the Heatwave List Changes<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"warm-up-and-deliverability-testing-two-different-functions\"><\/span>Warm-up and deliverability testing: two different functions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Many comparisons categorize warm-up tools as testing tools. This is a misunderstanding. <strong>A test measures. A warm-up takes action<\/strong>: it seeks to build a reputation by generating activity between mailboxes on a network.<\/p>\n<p>We&#8217;ve tested several of these services, such as <a href=\"https:\/\/salesdorado.com\/en\/cold-email\/review-warmy-io\/\">Warmy<\/a> and <a href=\"https:\/\/salesdorado.com\/en\/cold-email\/review-lemwarm\/\">lemwarm<\/a>, <a href=\"https:\/\/salesdorado.com\/en\/linkedin-outreach\/review-lemlist\/\">lemlist&#8217;s<\/a> warm-up tool. Email address verification is yet another specialized task: it prevents bounce-backs before sending, and we&#8217;ve dedicated a <a href=\"https:\/\/salesdorado.com\/en\/automation\/tools-check-email-lists\/\">separate selection of tools<\/a> to it.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"heatwave-how-to-check-that-your-domains-arent-flagged\"><\/span>Heatwave: How to Check That Your Domains Aren\u2019t Flagged<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>On September 3, 2026, Validity launched Heatwave, a blocklist that targets the artificial warm-up of domains. According to its <a href=\"https:\/\/www.validity.com\/press-releases\/validity-launches-heatwave-blocklist-to-combat-unethical-cold-email-practices-and-synthetic-domain-warming\/\" target=\"_blank\" rel=\"noopener\">Heatwave launch announcement<\/a>, more than one million domains are already on the list. The initiative targets services that generate fake messages, opens, clicks, and replies within networks of fake accounts\u2014sometimes after registering domains similar to the client\u2019s.<\/p>\n<p>The signal is used or evaluated by Comcast, Proofpoint, Spamhaus, and SURBL. Proofpoint, in fact, is the first gateway in our analysis. Validity itself sells deliverability solutions, but the involvement of Spamhaus and SURBL\u2014two leaders in the fight against spam\u2014lends credibility to the initiative.<\/p>\n<p>The check is free: enter your primary domain at <a href=\"https:\/\/lookup.validity.tools\/\" target=\"_blank\" rel=\"noopener\">lookup.validity.tools<\/a>. According to Validity, the search may reveal related domains you didn&#8217;t know existed, since some providers register domains using a brand name without the company&#8217;s knowledge.<\/p>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-71636\" src=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/Heatwave-Domain-Blocklist-scaled.png\" alt=\"\" width=\"2048\" height=\"1075\" srcset=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/Heatwave-Domain-Blocklist-scaled.png 2048w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/Heatwave-Domain-Blocklist-300x157.png 300w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/Heatwave-Domain-Blocklist-1024x537.png 1024w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/Heatwave-Domain-Blocklist-768x403.png 768w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/Heatwave-Domain-Blocklist-1536x806.png 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/p>\n<div class=\"blocTips danger-light\"><i class=\"fa fa-exclamation-triangle\"><\/i><span class=\"title is-5\">Is your warm-up tool affected?<\/span><br \/>\nValidity&#8217;s press release targets practices, not brands: no specific tools are mentioned. If you use a warm-up service, ask them how they generate engagement and check your domains on Heatwave. A gradual ramp-up toward your most engaged contacts remains the safest method.<\/div>\n<h2><span class=\"ez-toc-section\" id=\"testing-deliverability-before-a-campaign-our-protocol\"><\/span>Testing Deliverability Before a Campaign: Our Protocol<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Here is the process we recommend following before every major campaign:<\/p>\n<ol>\n<li><strong>Check for technical compliance.<\/strong> Send your email to aboutmy.email or Mail-tester: SPF, DKIM, and DMARC must pass, and your marketing emails must include a one-click unsubscribe option.<\/li>\n<li><strong>Check blocklists.<\/strong> Run your IP and domain through MXToolbox and Barracuda, then run your primary domain through Heatwave.<\/li>\n<\/ol>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-71640\" src=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/mxtoolbox-blacklist-scaled.png\" alt=\"\" width=\"2048\" height=\"886\" srcset=\"https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/mxtoolbox-blacklist-scaled.png 2048w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/mxtoolbox-blacklist-300x130.png 300w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/mxtoolbox-blacklist-1024x443.png 1024w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/mxtoolbox-blacklist-768x332.png 768w, https:\/\/salesdorado.com\/wp-content\/uploads\/2026\/09\/mxtoolbox-blacklist-1536x665.png 1536w\" sizes=\"(max-width: 2048px) 100vw, 2048px\" \/><\/p>\n<ol>\n<li><strong>Identify your target&#8217;s email system.<\/strong> Apply the MX method to a sample of 20 to 50 domains from your file.<\/li>\n<li><strong>Run a tailored delivery test.<\/strong> Choose the tool based on this distribution and send the test from your actual sending platform, using the same domain and template as the campaign.<\/li>\n<li><strong>Add a real-world test.<\/strong> Include a few trusted contacts\u2014customers or partners\u2014who use Microsoft 365 or are protected by a gateway in the email. Ask them where the message landed.<\/li>\n<li><strong>Increase your send volume gradually.<\/strong> Monitor Postmaster Tools (and SNDS if you have a dedicated IP) as well as rejection codes: \u201c550 5.7.515\u201d for Outlook.com, and the 4.7.x and 5.7.x series for Gmail.<\/li>\n<li><strong>Base your assessment on reliable metrics.<\/strong> Responses and bounces matter more than opens, which are skewed in particular by Apple\u2019s privacy settings.<\/li>\n<\/ol>\n<p>Run a full test every time you add a new domain or a new sending tool. That&#8217;s often when problems arise.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions-about-deliverability-testing\"><\/span>Frequently Asked Questions About Deliverability Testing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"what-is-the-best-free-tool-for-testing-deliverability\"><\/span>What is the best free tool for testing deliverability?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No free tool covers everything. For technical compliance, Mail-tester and aboutmy.email are sufficient. For placement, the GMass tester is free and includes Google Workspace mailboxes protected by gateways. Add Google Postmaster Tools if some of your recipients use Gmail.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"is-mail-tester-reliable-for-testing-deliverability\"><\/span>Is Mail-tester reliable for testing deliverability?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes, for what it measures: an email\u2019s technical compliance and anti-spam score. No, for predicting placement. A 10\/10 score doesn\u2019t tell you whether your message will land in the inbox in Microsoft 365 or behind a gateway like Proofpoint. Use it as a prerequisite.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"how-can-you-test-deliverability-to-microsoft-365\"><\/span>How can you test deliverability to Microsoft 365?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Choose a tool whose seed list includes Office 365 mailboxes, such as GlockApps or MailReach, and then follow up with a test email sent to a few contacts who have Office 365 accounts. Microsoft SNDS won\u2019t help you with this target: it only covers consumer email accounts and can only be used with a dedicated IP address.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"does-a-placement-test-reflect-reality\"><\/span>Does a placement test reflect reality?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Only partially. Test inboxes have no history of engagement with you, whereas Gmail and Microsoft also filter based on each recipient&#8217;s behavior. A placement test is a reliable warning sign for identifying a problem, not an accurate measure of what your prospects will see.<\/p>\n<div class=\"blocTips success-light\">\n<p><i class=\"fa fa-book\"><\/i><span class=\"title is-5\">Learn More<\/span><\/p>\n<ul>\n<li style=\"list-style-type: none\">\n<ul>\n<li><a href=\"https:\/\/salesdorado.com\/en\/cold-email\/email-marketing-figures\/\">Key Statistics on Email Prospecting<\/a><\/li>\n<li><a href=\"https:\/\/salesdorado.com\/en\/inbound-marketing\/b2b-emailing-campaigns\/\">How to Make Your B2B Email Campaigns a Success<\/a><\/li>\n<li><a href=\"https:\/\/salesdorado.com\/en\/cold-email\/b2b-prospecting-emails\/\">Writing Your B2B Prospecting Emails<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div>\n<div style=\"display: none;\"\n    class=\"kk-star-ratings kksr-valign-bottom kksr-align-center \"\n    data-id=\"71678\"\n    data-slug=\"\">\n    <div class=\"kksr-stars\">\n    <div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\">\n            <div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\">\n            <div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\">\n            <div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\">\n            <div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\">\n            <div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    <div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\">\n            <div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\">\n            <div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\">\n            <div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\">\n            <div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\">\n            <div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n    <div class=\"kksr-legend\">\n            <span class=\"kksr-muted\">Qu'avez-vous pens\u00e9 de cet article?<\/span>\n    <\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Does your email marketing tool show a delivery rate of over 98%? This figure simply [&hellip;]<\/p>\n","protected":false},"author":2810,"featured_media":71674,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[285,255],"tags":[],"class_list":["post-71678","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cold-email","category-email-marketing-software"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>6 Tools to Test Your Email Deliverability in 2026 | Salesdorado<\/title>\n<meta name=\"description\" content=\"We analyzed the email systems of 100 companies to find out which tools actually test B2B deliverability. 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