{"id":98916,"date":"2022-05-19T05:56:34","date_gmt":"2022-05-19T05:56:34","guid":{"rendered":"https:\/\/www.stellarinfo.com\/blog\/?p=98916"},"modified":"2025-11-27T05:03:38","modified_gmt":"2025-11-27T05:03:38","slug":"how-to-troubleshoot-mail-flow-issues-in-exchange-server","status":"publish","type":"post","link":"https:\/\/www.stellarinfo.com\/blog\/how-to-troubleshoot-mail-flow-issues-in-exchange-server\/","title":{"rendered":"How to Troubleshoot Mail Flow Issues in Exchange Server?"},"content":{"rendered":"<?xml encoding=\"utf-8\" ?><?xml encoding=\"utf-8\" ?><p>If all the users are complaining that no emails are received or sent, it is a nightmare for any Exchange Server administrator. This can affect the entire communication and also the business of an organization. Therefore, the administrator has to quickly resolve the issue to bring the mail flow back. In this post, we will be discussing how to troubleshoot mail flow issues in Exchange Server &ndash; from 2010 till 2019.<\/p><h2 class=\"wp-block-heading\" id=\"what-triggers-mail-flow-issues?\"><strong>What triggers mail flow issues?<\/strong><\/h2><p>The first thing to do is find out the reasons for such an issue. You can check what has changed in the current server setup. The best idea is to always keep a log of who had and what was changed. This way, if there would be a configuration issue, it&rsquo;s easy to trace back and roll back any changes to identify the issue. Mail flow issue can be triggered after migration to a newer Exchange Server or due to a problem during an update of Exchange Server after installing a Cumulative Update (CU).<\/p><h2 class=\"wp-block-heading\" id=\"troubleshooting-process\"><strong>Troubleshooting Process<\/strong><\/h2><p>Let&rsquo;s start by checking the queue of the Exchange Server to know if there are any issues with some emails that would be blocking the delivery of emails. This can be done by using the <strong>Get-Queue<\/strong> command in the <strong>Exchange Management Shell (EMS)<\/strong>.<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"940\" height=\"185\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image.png\" alt=\"Troubleshooting process: How to Troubleshoot Mail Flow Issues in Exchange Server?\" class=\"wp-image-98925 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image.png 940w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-300x59.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-768x151.png 768w\" sizes=\"auto, (max-width: 940px) 100vw, 940px\" \/><\/figure>\n<\/div><p>This will give a clear indication if the emails are delivered, being processed, or processing is stopped.<\/p><p>Make sure that the services of Exchange Server, set as automatic, are all running and started from the Services.<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"878\" height=\"514\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-2.png\" alt=\"Stellar\" class=\"wp-image-98932 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-2.png 878w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-2-300x176.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-2-768x450.png 768w\" sizes=\"auto, (max-width: 878px) 100vw, 878px\" \/><\/figure>\n<\/div><p>External factors would include network changes. Verify with the network team, if there were any changes in the port blocking the business routers or any changes in the perimeter firewalls. Next, confirm with the Server Administrators that there were no changes in the Windows Firewall rules.<\/p><p>You can check the internet domain MX records and others. You can also check if the external IP address of the Exchange Server is blacklisted.<\/p><p>Exchange Server email delivery is based on the send and receive connectors. You must ensure that these are working fine.<\/p><p>Open the <strong>Exchange Admin Center (EAC)<\/strong> and log in with your Exchange Administrator account.<\/p><p>Click on <strong>Mail Flow.<\/strong><\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"940\" height=\"292\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-3.png\" alt=\"How to Troubleshoot Mail Flow Issues in Exchange Server Using Exchange Admin Center\" class=\"wp-image-98933 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-3.png 940w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-3-300x93.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-3-768x239.png 768w\" sizes=\"auto, (max-width: 940px) 100vw, 940px\" \/><\/figure>\n<\/div><p>Here, you will see most of the factors that would affect email delivery.<\/p><p>In the <strong>Rules<\/strong>, check if there are any new rules that have affected the delivery.<br><\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"859\" height=\"311\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-4.png\" alt=\"Stellar\" class=\"wp-image-98935 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-4.png 859w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-4-300x109.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-4-768x278.png 768w\" sizes=\"auto, (max-width: 859px) 100vw, 859px\" \/><\/figure>\n<\/div><p>Make sure that the domains used are listed and no errors are showing in the <strong>Accepted<\/strong> <strong>Domains<\/strong>.<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"886\" height=\"314\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-5.png\" alt=\"Stellar\" class=\"wp-image-98936 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-5.png 886w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-5-300x106.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-5-768x272.png 768w\" sizes=\"auto, (max-width: 886px) 100vw, 886px\" \/><\/figure>\n<\/div><p>In the <strong>receive<\/strong> <strong>connectors<\/strong> (incoming emails), you can check that there are no new connectors or new configurations that might be the culprit in the email delivery issue. You can disable the connectors, leaving only the bare minimum to ensure and test accordingly.<\/p><div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"940\" height=\"428\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-6.png\" alt=\"Stellar\" class=\"wp-image-98937 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-6.png 940w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-6-300x137.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2022\/05\/image-6-768x350.png 768w\" sizes=\"auto, (max-width: 940px) 100vw, 940px\" \/><\/figure>\n<\/div><p>Same thing applied for issues with outgoing emails. Check the <strong>send<\/strong> <strong>connectors<\/strong>.<\/p><p>You can also launch the Exchange Remote Connectivity Analyzer Tool. This can be used from the <a href=\"https:\/\/testconnectivity.microsoft.com\/tests\/exchange\">Microsoft site<\/a>. This is a web tool that is used to check inbound and outbound emails. This can confirm connectivity from outside your network and provide a better understanding of the problem.<\/p><h2 class=\"wp-block-heading\" id=\"the-conclusion\"><strong>The Conclusion<\/strong><\/h2><p>In events where there is a problem with the Exchange Server installation after migration or Cumulative Update (CU), or if the Exchange Server is not responding or receiving any emails, you can rely on <strong><a href=\"https:\/\/www.stellarinfo.com\/exchange-migration.php\">Stellar Migrator for Exchange<\/a><\/strong>. You can set up a new Exchange Server and effortlessly migrate all mailboxes, public folders, and other data using this powerful application ensuring zero downtime and no data loss.<\/p><p>Unlike native tools, <strong>Stellar Migrator for Exchange<\/strong> supports seamless migration between any Exchange Server versions and even between Exchange and Office 365. It allows granular migration of user mailboxes, shared mailboxes, archives, and public folders, without any size limitations. You can easily map and migrate mailboxes through an intuitive interface with advanced features such as <strong>automatic mailbox matching, parallel migration, and resume migration<\/strong> if the process is interrupted.<\/p><p>The tool ensures smooth, secure, and efficient migration, making it an ideal choice for Exchange administrators looking for a reliable post-migration or upgrade solution.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If all the users are complaining that no emails are received or&hellip; <a class=\"more-link\" href=\"https:\/\/www.stellarinfo.com\/blog\/how-to-troubleshoot-mail-flow-issues-in-exchange-server\/\">Continue reading <span class=\"screen-reader-text\">How to Troubleshoot Mail Flow Issues in Exchange Server?<\/span><\/a><\/p>\n","protected":false},"author":32,"featured_media":98972,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6218],"tags":[629],"class_list":["post-98916","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-exchange-migration","tag-exchange","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Troubleshoot Mail Flow Issues in Exchange Server?<\/title>\n<meta name=\"description\" content=\"Can&#039;t send or receive email? 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He is an expert Tech Explainer, IoT enthusiast, and a passionate nerd with over 7 years of experience in technical writing. He writes about Microsoft Exchange, Microsoft 365, Email Migration, Linux, Windows, Mac, DIY Tech, and Smart Home. Ravi spends most of his weekends working with IoT (DIY Smart Home) devices and playing Overwatch. 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