{"id":1941,"date":"2024-05-28T10:10:19","date_gmt":"2024-05-28T10:10:19","guid":{"rendered":"https:\/\/www.mailercloud.com\/blog\/?p=1941"},"modified":"2026-10-08T04:32:35","modified_gmt":"2026-10-08T04:32:35","slug":"gmail-rejections-and-bounces-more-on-email-deliverability-challenges","status":"publish","type":"post","link":"https:\/\/www.mailercloud.com\/blog\/gmail-rejections-and-bounces-more-on-email-deliverability-challenges","title":{"rendered":"Gmail Rejections and Bounces: More On Email Deliverability Challenges"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.mailercloud.com\/\">Email deliverability<\/a> can sometimes feel like a maze, especially when dealing with platforms like Gmail that have strict filters to keep things safe and smooth for users. This article is a must-read for anyone handling email campaigns or server management. We\u2019ll dive into why Gmail might say no to emails, how to decode bounce messages, and ways to up your email game.<\/p>\n\n\n\n<div class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\" id=\"ez-toc-container\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<p><span class=\"ez-toc-title-toggle\"><\/span><\/p><\/div>\n<nav>\n<ul class=\"ez-toc-list ez-toc-list-level-1\">\n<li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.mailercloud.com\/blog\/gmail-rejections-and-bounces-more-on-email-deliverability-challenges\/#What_Makes_an_Email_Bounce\">What Makes an Email Bounce?<\/a><\/li>\n<li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.mailercloud.com\/blog\/gmail-rejections-and-bounces-more-on-email-deliverability-challenges\/#How_Gmail_Sniffs_Out_Spam_and_Blocks_Emails\">How Gmail Sniffs Out Spam and Blocks Emails<\/a><\/li>\n<li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.mailercloud.com\/blog\/gmail-rejections-and-bounces-more-on-email-deliverability-challenges\/#SMTPs_Role_in_Email_Delivery\">SMTP\u2019s Role in Email Delivery<\/a><\/li>\n<li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.mailercloud.com\/blog\/gmail-rejections-and-bounces-more-on-email-deliverability-challenges\/#Understanding_Deferred_Emails_in_Gmail\">Understanding Deferred Emails in Gmail<\/a><\/li>\n<li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.mailercloud.com\/blog\/gmail-rejections-and-bounces-more-on-email-deliverability-challenges\/#SPF_DKIM_and_DMARCs_Influence_on_Gmail_Server\">SPF, DKIM, and DMARC\u2019s Influence on Gmail Server<\/a><\/li>\n<li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.mailercloud.com\/blog\/gmail-rejections-and-bounces-more-on-email-deliverability-challenges\/#Tips_to_Dodge_Gmails_Spam_Radar\">Tips to Dodge Gmail\u2019s Spam Radar<\/a><\/li>\n<li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.mailercloud.com\/blog\/gmail-rejections-and-bounces-more-on-email-deliverability-challenges\/#Key_Points\">Key Points<\/a><\/li>\n<\/ul>\n<\/nav>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Makes_an_Email_Bounce\"><\/span><span class=\"ez-toc-section\" id=\"What_Makes_an_Email_Bounce\"><\/span><strong>What Makes an Email Bounce?<\/strong><span class=\"ez-toc-section-end\"><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image is-resized size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"870\" height=\"397\" src=\"https:\/\/www.mailercloud.com\/blog\/wp-content\/uploads\/2024\/05\/bounce-reason.jpg\" alt=\"What Makes an Email Bounce?\" class=\"wp-image-1992\" style=\"aspect-ratio:2.191435768261965;width:870px;height:auto\" srcset=\"https:\/\/www.mailercloud.com\/blog\/wp-content\/uploads\/2024\/05\/bounce-reason.jpg 870w, https:\/\/www.mailercloud.com\/blog\/wp-content\/uploads\/2024\/05\/bounce-reason-150x68.jpg 150w, https:\/\/www.mailercloud.com\/blog\/wp-content\/uploads\/2024\/05\/bounce-reason-768x350.jpg 768w\" sizes=\"auto, (max-width: 870px) 100vw, 870px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Emails can bounce for different reasons, like typos in the recipient\u2019s email or a server taking a breather. When an email bounces, the server shoots a message back to the sender explaining why the delivery didn\u2019t work. Understanding these messages is key to keeping your contact list tidy and boosting email reach.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a deeper dive, see <a href=\"https:\/\/www.mailercloud.com\/blog\/activecampaign-alternatives\">Best ActiveCampaign Alternatives<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Gmail_Sniffs_Out_Spam_and_Blocks_Emails\"><\/span><span class=\"ez-toc-section\" id=\"How_Gmail_Sniffs_Out_Spam_and_Blocks_Emails\"><\/span><strong>How Gmail Sniffs Out Spam and Blocks Emails<\/strong><span class=\"ez-toc-section-end\"><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Gmail has smart tools to sniff out spam and shady emails. They look at things like who\u2019s sending it, what\u2019s inside, and if users give the thumbs down (mark as spam). To make sure your emails skip the reject list, watch out for these filters.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"SMTPs_Role_in_Email_Delivery\"><\/span><span class=\"ez-toc-section\" id=\"SMTPs_Role_in_Email_Delivery\"><\/span><strong>SMTP\u2019s Role in Email Delivery<\/strong><span class=\"ez-toc-section-end\"><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SMTP is the internet\u2019s postman for emails. It zips messages between servers. But if there\u2019s a hiccup in the setup or no password check, your email might get sent back.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Detailed Guide: <a href=\"https:\/\/www.mailercloud.com\/blog\/smtp-understanding-the-simple-mail-transfer-protocol\">SMTP: Understanding the Simple Mail Transfer Protocol<\/a><\/em><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Understanding_Deferred_Emails_in_Gmail\"><\/span><span class=\"ez-toc-section\" id=\"Understanding_Deferred_Emails_in_Gmail\"><\/span><strong>Understanding Deferred Emails in Gmail<\/strong><span class=\"ez-toc-section-end\"><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A deferred email is like a delayed high-five from Gmail. It happens when Gmail holds off on delivering an email due to busy servers or a side-eye at the sender\u2019s digital address. Knowing why emails get paused can help you tweak your sending habits.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>421 4.7.27 Rate Limit Due to SPF Fail:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Message: SPF authentication failed, leading to rate limiting.<\/li>\n\n\n\n<li>Implication: Emphasizes the need for SPF alignment.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>421 4.7.26 Rate Limit Due to Unauthenticated Mail:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Message: Unauthenticated mail causing rate limit.<\/li>\n\n\n\n<li>Implication: Stresses SPF\/DKIM authentication importance.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>421 4.7.32 Rate Limit Due to Lack of Alignment:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Message: RFC5322.From Header misalignment results in rate limit.<\/li>\n\n\n\n<li>Implication: Importance of header alignment for delivery.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>421 4.7.0 Suspicious Domain Reputation:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Message: Low domain reputation leads to message block.<\/li>\n\n\n\n<li>Implication: Addressing domain reputation for deliverability.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>IP Reputation\u2019s Email Impact<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image is-resized size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"870\" height=\"397\" src=\"https:\/\/www.mailercloud.com\/blog\/wp-content\/uploads\/2024\/05\/ip_reputation.jpg\" alt=\"IP Reputation's\" class=\"wp-image-1994\" style=\"aspect-ratio:2.191435768261965;width:870px;height:auto\" srcset=\"https:\/\/www.mailercloud.com\/blog\/wp-content\/uploads\/2024\/05\/ip_reputation.jpg 870w, https:\/\/www.mailercloud.com\/blog\/wp-content\/uploads\/2024\/05\/ip_reputation-150x68.jpg 150w, https:\/\/www.mailercloud.com\/blog\/wp-content\/uploads\/2024\/05\/ip_reputation-768x350.jpg 768w\" sizes=\"auto, (max-width: 870px) 100vw, 870px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Having a good rep online is gold for email delivery. If your IP address is known for spammy behavior, Gmail might slam the door on all emails from that spot. Keeping your IP and domain clean is vital for getting your messages through.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"SPF_DKIM_and_DMARCs_Influence_on_Gmail_Server\"><\/span><span class=\"ez-toc-section\" id=\"SPF_DKIM_and_DMARCs_Influence_on_Gmail_Server\"><\/span><strong>SPF, DKIM, and DMARC\u2019s Influence on Gmail Server<\/strong><span class=\"ez-toc-section-end\"><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SPF, DKIM and DMARC are like digital ID cards for senders. Getting them right matters as they sway Gmail\u2019s filter choices.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SPF helps verify if the email is sent from an authorized server, DKIM adds a digital signature to confirm the email\u2019s authenticity, and DMARC helps prevent email spoofing and phishing attacks by enforcing SPF and DKIM policies.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When these protocols are properly set up, Gmail\u2019s servers are more likely to trust the emails sent from your domain, reducing the chances of them being marked as spam or rejected.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tips_to_Dodge_Gmails_Spam_Radar\"><\/span><span class=\"ez-toc-section\" id=\"Tips_to_Dodge_Gmails_Spam_Radar\"><\/span><strong>Tips to Dodge Gmail\u2019s Spam Radar<\/strong><span class=\"ez-toc-section-end\"><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Gmail shares reasons why emails go MIA, giving clues on how to fix issues. To dodge the spam bin, follow these steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Craft relevant and eye-catching emails to grab recipients\u2019 attention.<\/li>\n\n\n\n<li>Regularly update your email lists to ensure they are current and accurate.<\/li>\n\n\n\n<li>Comply with Gmail\u2019s guidelines and rules to avoid being flagged as spam.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Related Article:<a href=\"https:\/\/www.mailercloud.com\/blog\/gmail-security-authentication-spam-protection\"> New Gmail Protections for a Safer Inbox: How Google is Making Email More Secure for Gmail Users<\/a><\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>If Gmail Blocks You<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">If Gmail isn\u2019t feeling your emails, check your practices, follow the rules, boost your rep, and double-check your setup.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>The Impact of Compliance and Policies<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Knowing the dos and don\u2019ts of email sending can make or break your delivery success. Sticking to rules like GDPR and best practices keeps you in Gmail\u2019s good books.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Key_Points\"><\/span><span class=\"ez-toc-section\" id=\"Key_Points\"><\/span><strong>Key Points<\/strong><span class=\"ez-toc-section-end\"><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Watch Bounce Rates<\/li>\n\n\n\n<li>Nail Authentication Protocols<\/li>\n\n\n\n<li>Guard Your IP Rep<\/li>\n\n\n\n<li>Decode Gmail\u2019s Filters<\/li>\n\n\n\n<li>Keep It Legit to reach your recipients<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Email deliverability on Gmail isn\u2019t a walk in the park. It takes tech smarts, rule following, and keeping tabs on how well your emails are doing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Email deliverability can sometimes feel like a maze, especially when dealing with platforms like Gmail that have strict filters to keep things safe and smooth for users. This article is a must-read for anyone handling email campaigns or server management. We\u2019ll dive into why Gmail might say no to emails, how to decode bounce messages, [&hellip;]<\/p>\n","protected":false},"author":21,"featured_media":1972,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1941","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-email-marketing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A Guide To Gmail Rejection And Email Deferral Messages<\/title>\n<meta name=\"description\" content=\"Discover how to manage your Gmail efficiently with tips on handling email deferrals &amp; understanding email senders.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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