{"id":33876,"date":"2025-04-09T17:25:20","date_gmt":"2025-04-09T14:25:20","guid":{"rendered":"https:\/\/snov.io\/blog\/?p=33876"},"modified":"2025-05-06T14:36:00","modified_gmt":"2025-05-06T11:36:00","slug":"microsoft-outlook-new-email-requirements-for-bulk-senders","status":"publish","type":"post","link":"https:\/\/snov.io\/blog\/microsoft-outlook-new-email-requirements-for-bulk-senders\/","title":{"rendered":"Microsoft Outlook\u2019s New Email Sender Rules: What B2B Marketers &#038; Bulk Senders Need to Do"},"content":{"rendered":"<p><b>TL;DR: <\/b><span style=\"font-weight: 400;\">In this post, we\u2019ll break down Microsoft Outlook\u2019s new guidelines that take effect on May 5, 2025, and analyze what these changes mean for B2B email marketers, lead generation specialists, and bulk email senders. We will offer actionable tips on what you can do to ensure your emails land in inboxes\u2014not spam folders\u2014while staying fully compliant with Microsoft\u2019s updated requirements.<\/span><\/p>\n<hr \/>\n<p><span style=\"font-weight: 400;\">If you were hoping the dust had finally settled after the major <\/span><a href=\"https:\/\/snov.io\/blog\/email-sender-guidelines\/\"><span style=\"font-weight: 400;\">sender requirements<\/span><\/a><span style=\"font-weight: 400;\"> from Google and Yahoo last year, it\u2019s time to buckle up again. Microsoft is now following suit with its own set of requirements.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In an April 2 blog post, the company announced that it will begin enforcing new email sender rules for bulk emailers targeting Outlook.com, Hotmail.com, and Live.com users.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">But as always, Snov.io is here to help you stay ahead of the curve with insights from our email deliverability experts, step-by-step guidance, and tools to ensure your cold outreach remains compliant and effective.<\/span><\/p>\n<div class=\"table-of-contents\">\n<p class=\"table-of-contents__title\">Key points:<\/p>\n<ul>\n<li><a href=\"#what\">What are the new Microsoft Outlook sender requirements?<\/a><\/li>\n<li><a href=\"#email\">Email deliverability recommendations<\/a><\/li>\n<li><a href=\"#timeline\">Timeline<\/a><\/li>\n<li><a href=\"#how\">How Snov.io can help you get ready for Microsoft Outlook sender requirements<\/a><\/li>\n<\/ul>\n<\/div>\n<h2 id=\"what\"><span style=\"font-weight: 400;\">What are the new Microsoft Outlook sender requirements?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Beginning May 5, 2025, Microsoft will start rejecting unauthenticated emails from domains that send over 5,000 messages daily.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This means that high-volume email senders will have to comply with the <\/span><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\"><span style=\"font-weight: 400;\">following standards<\/span><\/a><span style=\"font-weight: 400;\">:<\/span><\/p>\n<p><b>SPF (Sender Policy Framework)<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Your domain\u2019s SPF must pass for <\/span><span style=\"font-weight: 400;\">t<\/span><span style=\"font-weight: 400;\">he sending domain.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">DNS SPF record has to <\/span><i><span style=\"font-weight: 400;\">accurately list all authorized sending IPs\/hosts<\/span><\/i><span style=\"font-weight: 400;\"> for that domain.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Failing SPF will count as non-compliance.<\/span><\/p>\n<p><b>DKIM (DomainKeys Identified Mail)<\/b><span style=\"font-weight: 400;\">:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Your messages must be DKIM-signed and pass DKIM checks to validate email authenticity.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Microsoft expects DKIM signatures that confirm the sender\u2019s identity (the signing domain should match or be aligned with the <\/span><i><span style=\"font-weight: 400;\">From<\/span><\/i><span style=\"font-weight: 400;\"> domain).<\/span><\/p>\n<p><b>DMARC (Domain-Based Message Authentication, Reporting &amp; Conformance)<\/b><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">You must publish a DMARC policy for your domain (at <\/span><i><span style=\"font-weight: 400;\">least<\/span><\/i><span style=\"font-weight: 400;\"> p=none) and achieve identifier alignment on either SPF or DKIM (preferably both.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In practice, this means the <\/span><i><span style=\"font-weight: 400;\">From:<\/span><\/i><span style=\"font-weight: 400;\"> header domain should match the domain authenticated by SPF or DKIM. If DMARC fails, Outlook will consider the message non-compliant.<\/span><\/p>\n<p><i><span style=\"font-weight: 400;\">\u201cFor domains sending over 5,000 emails per day, Outlook will soon require compliance with SPF, DKIM, DMARC\u2026 Non\u2010compliant messages will be rejected.\u201d<\/span><\/i><\/p>\n<h2 id=\"email\"><span style=\"font-weight: 400;\">Email deliverability recommendations<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Beyond just authentication, Microsoft also shares practical tips for maintaining <\/span><a href=\"https:\/\/snov.io\/blog\/email-list-cleaning\/\"><span style=\"font-weight: 400;\">email hygiene<\/span><\/a><span style=\"font-weight: 400;\">. So, if you are a high-volume email sender, make sure to adopt these practices:<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Compliant P2 (Primary) Sender Addresses<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Microsoft says the \u201cFrom\u201d (or Reply-To) should be a valid address <\/span><i><span style=\"font-weight: 400;\">on your domain<\/span><\/i><span style=\"font-weight: 400;\"> that can receive responses. This ensures accountability and allows recipients to reply if needed.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, we advise against using addresses such as <\/span><a href=\"mailto:no-reply@yourdomain.com\"><span style=\"font-weight: 400;\">no-reply@yourdomain.com<\/span><\/a><span style=\"font-weight: 400;\">, because they can hurt your email deliverability and sender reputation.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Include an easy unsubscribe option<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Provide a functional unsubscribe link that is clearly visible to your recipients. Microsoft wants bulk emails (newsletters, promotions, etc.) to offer a one-click or simple way to opt out of future messages.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Microsoft defines a \u201cfunctional\u201d unsubscribe as one that <\/span><i><span style=\"font-weight: 400;\">\u201callows recipients to quickly opt out of future mail\u2026 easy to find and reliable when clicked.\u201d<\/span><\/i><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Maintain email list hygiene<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Proactively remove invalid or inactive emails to reduce bounces and spam complaints.<\/span><\/p>\n<ul>\n<li aria-level=\"1\"><b>Implement transparent mailing practices<\/b><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Use transparent mailing practices \u2013 no deceptive subject lines or misleading headers. Ensure you only send emails to users who have given consent.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">So, if you are a bulk email sender who uses Microsoft Outlook, following these requirements is a must.<\/span><\/p>\n<h2 id=\"timeline\"><span style=\"font-weight: 400;\">Timeline<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Microsoft Outlook encourages all senders to start updating their SPF, DKIM, and DMARC records now.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Starting May 5, 2025, they will begin rejecting <span>messages that don&#8217;t correspond to the required authentication requirements. The rejected messages will be marked as &#8220;550; 5.7.515 Access denied, sending domain [SendingDomain] does\u00a0<\/span><strong>not<\/strong><span>\u00a0meet the required authentication level.&#8221;<\/span><\/span><\/p>\n<h2 id=\"how\"><span style=\"font-weight: 400;\">How Snov.io can help you get ready for Microsoft Outlook sender requirements<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">So, as we\u2019ve mentioned at the beginning, Snov.io is ready to support you every step of the way\u2014whether it\u2019s ensuring your authentication setup is on point or keeping your sender reputation safe.<\/span><\/p>\n<p>We&#8217;ve prepared a short checklist for you to help you prepare your email account quickly.<\/p>\n<h3><span style=\"font-weight: 400;\">Check your email deliverability<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">We highly recommend running deliverability tests on a regular basis. It can be before launching email campaigns or during active campaigns.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">With the Snov.io <\/span><a href=\"https:\/\/snov.io\/email-deliverability-test\"><span style=\"font-weight: 400;\">deliverability check<\/span><\/a><span style=\"font-weight: 400;\">, you will get the following info:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Domain health status, including but not limited to SPF, DKIM, and DMARC records<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Email placement status<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Email content analysis<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Spam check<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Domain and IP blacklists<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">In addition, the tool gives you personalized recommendations on how to fix deliverability issues!<\/span><\/p>\n<figure style=\"width: 746px\" class=\"wp-caption aligncenter fancybox-el\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/SCR-20250409-pdvv.png\" alt=\"email deliverability check\" width=\"746\" height=\"405\" class=\"aligncenter wp-image-33878\" srcset=\"https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/SCR-20250409-pdvv.png 2892w, https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/SCR-20250409-pdvv-300x163.png 300w, https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/SCR-20250409-pdvv-1024x556.png 1024w, https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/SCR-20250409-pdvv-768x417.png 768w, https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/SCR-20250409-pdvv-1536x834.png 1536w, https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/SCR-20250409-pdvv-2048x1112.png 2048w\" sizes=\"(max-width: 746px) 100vw, 746px\" \/><figcaption class=\"wp-caption-text\">Email deliverability test in the Snov.io app<\/figcaption><\/figure>\n<p><span style=\"font-weight: 400;\">\u2192 Learn more about <\/span><a href=\"https:\/\/snov.io\/knowledgebase\/how-to-test-and-improve-email-deliverability\/\"><span style=\"font-weight: 400;\">email deliverability test<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Set up proper DNS records: SPF, DKIM, DMARC<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">If the deliverability test finds any issues with these records, it will provide additional information on how you can fix that.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You can also set up these settings now with the help of our instructions:<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u2192<\/span><a href=\"https:\/\/snov.io\/knowledgebase\/set-up-spf-record-for-your-domain\/\"><span style=\"font-weight: 400;\"> How to set up SPF record<\/span><\/a><\/p>\n<p><span style=\"font-weight: 400;\">\u2192<\/span><a href=\"https:\/\/snov.io\/knowledgebase\/set-up-dkim-for-your-domain\/\"><span style=\"font-weight: 400;\"> How to set up DKIM record<\/span><\/a><\/p>\n<p><span style=\"font-weight: 400;\">\u2192<\/span><a href=\"https:\/\/snov.io\/knowledgebase\/set-up-dmarc-policy-for-your-domain\/\"><span style=\"font-weight: 400;\"> How to set up DMARC<\/span><\/a><\/p>\n<h3><span style=\"font-weight: 400;\">Verify email addresses<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Poor deliverability often starts with one major mistake: skipping email verification. This can result in blocked accounts and significantly reduce the effectiveness of your lead generation strategy.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">With the Snov.io <\/span><a href=\"https:\/\/snov.io\/email-verifier\"><span style=\"font-weight: 400;\">Email Verifier<\/span><\/a><span style=\"font-weight: 400;\">, you can check individual email addresses or verify them in bulk. We provide a 7-tier verification process to give you the most accurate results.<\/span><\/p>\n<table style=\"width: 100%; border-collapse: collapse; background-color: #e1edf7;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\">&nbsp;<\/p>\n<p><b>\ud83d\udca1 Expert tip<\/b><\/p>\n<p><span style=\"font-weight: 400;\">We recommend cleaning your email list every 6 months to keep your contact list healthy and up-to-date.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span style=\"font-weight: 400;\">Implement a one-click unsubscribe<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">To enable this feature, complete the following steps:<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Go to your <\/span><a href=\"https:\/\/app.snov.io\/campaigns\/\"><span style=\"font-weight: 400;\">campaigns list<\/span><\/a><span style=\"font-weight: 400;\"> and open campaign settings.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Select the <\/span><i><span style=\"font-weight: 400;\">Sending options<\/span><\/i><span style=\"font-weight: 400;\"> step.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\">Scroll down to the <\/span><i><span style=\"font-weight: 400;\">One-click unsubscribe<\/span><\/i><span style=\"font-weight: 400;\"> section and enable the switch.<\/span><\/p>\n<p><a href=\"https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/one-click-unsub.png\" data-fancybox=\"\"> <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/one-click-unsub.png\" alt=\"one-click unsubscribe for email deliverability\" width=\"717\" height=\"400\" class=\"aligncenter wp-image-33879\" srcset=\"https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/one-click-unsub.png 1345w, https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/one-click-unsub-300x167.png 300w, https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/one-click-unsub-1024x571.png 1024w, https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/one-click-unsub-768x428.png 768w\" sizes=\"(max-width: 717px) 100vw, 717px\" \/><\/a><\/p>\n<table style=\"width: 100%; border-collapse: collapse; background-color: #e1edf7;\">\n<tbody>\n<tr>\n<td style=\"width: 100%;\">&nbsp;<\/p>\n<p><b>\ud83d\udca1 Expert tip<\/b><\/p>\n<p>I<span style=\"font-weight: 400;\">nclude both a visible unsubscribe link in the email body <\/span><i><span style=\"font-weight: 400;\">and<\/span><\/i><span style=\"font-weight: 400;\"> a standard List-Unsubscribe header (to enable email client \u201cunsubscribe\u201d buttons).<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><span style=\"font-weight: 400;\">Use Provider matching<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">When emails are sent between accounts within the same provider, such as Gmail to Gmail, they typically have a higher chance of reaching the inbox.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Snov.io provides a Provider matching option, which means our tool automatically detects your recipient&#8217;s provider and uses the appropriate sender from the accounts added to this campaign.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To use this feature, complete the following steps:<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Go to your campaign settings.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Select the <\/span><i><span style=\"font-weight: 400;\">Sending options<\/span><\/i><span style=\"font-weight: 400;\"> step.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Scroll down to the <\/span><i><span style=\"font-weight: 400;\">Advanced settings<\/span><\/i><span style=\"font-weight: 400;\"> section and activate <\/span><i><span style=\"font-weight: 400;\">Provider matching<\/span><\/i><span style=\"font-weight: 400;\">.<\/span><\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/New-Campaign-01-06-2025_01_19_PM.png\" alt=\"provider matching\" width=\"746\" height=\"354\" class=\"aligncenter wp-image-33880\" srcset=\"https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/New-Campaign-01-06-2025_01_19_PM.png 1920w, https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/New-Campaign-01-06-2025_01_19_PM-300x142.png 300w, https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/New-Campaign-01-06-2025_01_19_PM-1024x486.png 1024w, https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/New-Campaign-01-06-2025_01_19_PM-768x364.png 768w, https:\/\/snov.io\/blog\/wp-content\/uploads\/2025\/04\/New-Campaign-01-06-2025_01_19_PM-1536x729.png 1536w\" sizes=\"(max-width: 746px) 100vw, 746px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">And this is it for now.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Make sure to comply with the new guidelines, and Snov.io will help you do the rest!<\/span><\/p>\n<div class=\"content-banner default\">\n<p class=\"content-banner__title\">Your all-in-one email deliverability solution<\/p>\n<p class=\"content-banner__description\">Solve multiple deliverability challenges with one tool!<\/p>\n<div class=\"content-banner__link\"><a href=\"https:\/\/app.snov.io\/register?lang=en&amp;signup_source=blog&amp;cta_type=banner\">Start today<\/a><\/div>\n<div class=\"content-banner__img\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/snov.io\/blog\/wp-content\/uploads\/2024\/12\/\u0440\u043e\u0437\u0441\u0438\u043b\u043a\u0430-\u0456\u043c\u0435\u0439\u043b\u0456\u0432-2.png\" alt=\"Your allin-one email deliverability solution\" width=\"224\" height=\"224\" \/><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Microsoft Outlook will implement new guidelines for bulk email senders. Read our post to learn all the details and get your email account ready!<\/p>\n","protected":false},"author":97,"featured_media":33883,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[470],"tags":[1164,1349,1351],"_links":{"self":[{"href":"https:\/\/snov.io\/blog\/wp-json\/wp\/v2\/posts\/33876"}],"collection":[{"href":"https:\/\/snov.io\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/snov.io\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/snov.io\/blog\/wp-json\/wp\/v2\/users\/97"}],"replies":[{"embeddable":true,"href":"https:\/\/snov.io\/blog\/wp-json\/wp\/v2\/comments?post=33876"}],"version-history":[{"count":10,"href":"https:\/\/snov.io\/blog\/wp-json\/wp\/v2\/posts\/33876\/revisions"}],"predecessor-version":[{"id":35251,"href":"https:\/\/snov.io\/blog\/wp-json\/wp\/v2\/posts\/33876\/revisions\/35251"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/snov.io\/blog\/wp-json\/wp\/v2\/media\/33883"}],"wp:attachment":[{"href":"https:\/\/snov.io\/blog\/wp-json\/wp\/v2\/media?parent=33876"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/snov.io\/blog\/wp-json\/wp\/v2\/categories?post=33876"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/snov.io\/blog\/wp-json\/wp\/v2\/tags?post=33876"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}