{"id":167814,"date":"2024-05-24T09:45:19","date_gmt":"2024-05-24T09:45:19","guid":{"rendered":"https:\/\/www.stellarinfo.com\/blog\/?p=167814"},"modified":"2025-11-27T05:59:33","modified_gmt":"2025-11-27T05:59:33","slug":"fix-server-returned-400-4-4-7-message-delayed-error-in-exchange-server","status":"publish","type":"post","link":"https:\/\/www.stellarinfo.com\/blog\/fix-server-returned-400-4-4-7-message-delayed-error-in-exchange-server\/","title":{"rendered":"How to Fix \u201cServer Returned 400 4.4.7 Message Delayed\u201d Error in Exchange Server?"},"content":{"rendered":"<?xml encoding=\"utf-8\" ?><?xml encoding=\"utf-8\" ?><p>It is common for users to experience errors and issues when sending emails in Exchange Server. One common error is Server Returned 400 4.4.7 Message Delayed. This error occurs when a user or users send an email to an external recipient. After sending the email, a Non-Delivery Report (NDR) is received with an error message like:<\/p><p>Delivery is delayed to these recipients or groups:<\/p><pre class=\"wp-block-code command_container\"><code><em>&lt;recipient&gt; (&lt;recipient email address&gt;)<\/em>\n<em>Subject: &lt;email subject&gt;<\/em>\n<em>This message hasn&rsquo;t been delivered yet. Delivery will continue to be attempted.<\/em>\n<em>The server will keep trying to deliver this message for the next 1 days, 19 hours and 57 minutes. You&rsquo;ll be notified if the message can&rsquo;t be delivered by that time.<\/em><\/code><\/pre><p>The message header will show the following information:<\/p><pre class=\"wp-block-code command_container\"><code><em>Remote Server returned &lsquo;400 4.4.7 Message delayed&rsquo;<\/em>\n<em>Original message headers:<\/em>\n<em>Received: from srv01.mycompany.lan (192.168.x.x) by\nsrv01.mycompany.lan (192.168.x.x) with Microsoft SMTP Server\n(TLS) id 21.1.234.32; Wed, 8 May 2024 20:40:00 +0100\nReceived: from srv01.mycompany.lan ([IPV6 address])\nby srv01.mycompany.lan ([IPV6 address]) with\nmapi id 12.11.353.010; Wed, 8 May 2024 20:40:00 +0100\nFrom: &lt;sender&gt; &lt;sender email address&gt;\nTo: &lt;recipient&gt; &lt;recipient email address&gt;<\/em><\/code><\/pre><p>From the error message, it seems there is a problem with protocol timeout or the message header limit. In most cases, this is a temporary issue. However, there are various other reasons that can lead to the &ldquo;Server Returned 400 4.4 7 Message Delayed&rdquo; error in the Exchange Server. Let&rsquo;s take a look at the possible reasons behind this error and see how to resolve the error.<\/p><h2 class=\"wp-block-heading\" id=\"reasons-for-&ldquo;server-returned-400-4.4.7-message-delayed&rdquo;-error-in-exchange-server\"><strong>Reasons for &ldquo;Server Returned 400 4.4.7 Message Delayed&rdquo; Error in Exchange Server<\/strong><\/h2><p>As the error is related to the delivery of the emails, there are various reasons that can lead to this error. Some possible reasons are:<\/p><ul class=\"wp-block-list\">\n<li>Issue with the external DNS of the domain, specifically with the MX record and the SPF record.<\/li>\n\n\n\n<li>Issue with the server&rsquo;s Input\/Output, network throughput, or general performance of the server due to which the messages are not being processed.<\/li>\n\n\n\n<li>Problems with throughput due to faulty hardware or interference by third-party software.<\/li>\n<\/ul><h2 class=\"wp-block-heading\" id=\"solutions-to-fix-&ldquo;server-returned-400-4.4.7-message-delayed&rdquo;-error-in-exchange-server\"><strong>Solutions to Fix &ldquo;Server Returned 400 4.4.7 Message Delayed&rdquo; Error in Exchange Server<\/strong><\/h2><p>The first thing you need to do is identify if the problem is related to a single mailbox or to a specific external domain. It might happen that the recipient&rsquo;s domain has an issue or the local Exchange Server is unable to resolve the MX record of the recipient&rsquo;s domain. To check this, you can use the <strong>nslookup<\/strong> command. Here are the steps:<\/p><ul class=\"wp-block-list\">\n<li>Open the command prompt as administrator on the server, where the Exchange Server is hosted. In the command prompt window, enter <strong>nslookup<\/strong> and press <strong>Enter<\/strong>.<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"261\" height=\"149\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/In-the-command-prompt-window-enter-nslookup-and-press-Enter.png\" alt=\"In the command prompt window enter nslookup and press Enter\" class=\"wp-image-167832 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/In-the-command-prompt-window-enter-nslookup-and-press-Enter.png 261w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/In-the-command-prompt-window-enter-nslookup-and-press-Enter-150x86.png 150w\" sizes=\"auto, (max-width: 261px) 100vw, 261px\" \/><\/figure><ul class=\"wp-block-list\">\n<li>Then, type <strong>set type = MX<\/strong> and press <strong>Enter<\/strong>.<\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"276\" height=\"165\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Then-type-set-type-MX-and-press-Enter-1.png\" alt=\"Then type set type MX and press Enter 1\" class=\"wp-image-167833 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Then-type-set-type-MX-and-press-Enter-1.png 276w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Then-type-set-type-MX-and-press-Enter-1-150x90.png 150w\" sizes=\"auto, (max-width: 276px) 100vw, 276px\" \/><\/figure><ul class=\"wp-block-list\">\n<li>Enter the domain name of the recipient and press <strong>Enter<\/strong><\/li>\n<\/ul><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"744\" height=\"263\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Enter-the-domain-name-of-the-recipient-and-press-Enter.png\" alt=\"Enter the domain name of the recipient and press Enter\" class=\"wp-image-167834 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Enter-the-domain-name-of-the-recipient-and-press-Enter.png 744w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Enter-the-domain-name-of-the-recipient-and-press-Enter-300x106.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Enter-the-domain-name-of-the-recipient-and-press-Enter-150x53.png 150w\" sizes=\"auto, (max-width: 744px) 100vw, 744px\" \/><\/figure><p>This will provide the MX records available to communicate to the domain.<\/p><p>However, if it shows &ldquo;can&rsquo;t find &lt;domain&gt;: Non-existent domain&rdquo;, then this means that the MX record cannot be found for the domain. This indicates an issue with the local DNS, the forwarding DNS, or the destination DNS service. In such a case, you can try to send a test email from an external source.<\/p><p>You can check if the messages are stuck in queue on the server. To do so, open the <strong>Exchange Toolbox<\/strong> management console and click on <strong>Queue<\/strong> <strong>Viewer<\/strong>.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"620\" height=\"313\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Exchange-Toolbox-management-console-and-click-on-Queue-Viewer.png\" alt=\"Exchange Toolbox management console and click on Queue Viewer\" class=\"wp-image-167835 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Exchange-Toolbox-management-console-and-click-on-Queue-Viewer.png 620w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Exchange-Toolbox-management-console-and-click-on-Queue-Viewer-300x151.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Exchange-Toolbox-management-console-and-click-on-Queue-Viewer-150x76.png 150w\" sizes=\"auto, (max-width: 620px) 100vw, 620px\" \/><\/figure><p>This will open the Queue Viewer window. Here, you can see the number of emails (incoming or outgoing) that are passing through the Exchange Server.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"766\" height=\"237\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/you-can-see-the-number-of-emails-incoming-or-outgoing-that-are-passing-through-the-Exchange-Server.png\" alt=\"Queue Viewer window\" class=\"wp-image-167836 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/you-can-see-the-number-of-emails-incoming-or-outgoing-that-are-passing-through-the-Exchange-Server.png 766w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/you-can-see-the-number-of-emails-incoming-or-outgoing-that-are-passing-through-the-Exchange-Server-300x93.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/you-can-see-the-number-of-emails-incoming-or-outgoing-that-are-passing-through-the-Exchange-Server-150x46.png 150w\" sizes=\"auto, (max-width: 766px) 100vw, 766px\" \/><\/figure><p>You can also check if there is a problem with storage or server performance, or if the server is underperforming due to software or hardware issues. For this, you can see the <strong>Resource<\/strong> <strong>Monitor<\/strong> and the <strong>Event<\/strong> <strong>Viewer<\/strong>.<\/p><p>To see where the problem is, you can also run the <strong>Get-MessageTrackingLog<\/strong> command.<\/p><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"298\" height=\"79\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Get-MessageTrackingLog-command.png\" alt=\"Get MessageTrackingLog command\" class=\"wp-image-167837 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Get-MessageTrackingLog-command.png 298w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Get-MessageTrackingLog-command-150x40.png 150w\" sizes=\"auto, (max-width: 298px) 100vw, 298px\" \/><\/figure><p>After running this command, you may notice the following error:<\/p><pre class=\"wp-block-code command_container\"><code><em>ServerHostname : MailServer\nSourceContext : No suitable shadow servers\nConnectorId : &lt;id&gt;\nSource : SMTP\nEventId : HAREDIRECTFAIL<\/em><\/code><\/pre><p>There could be an issue on the standalone Exchange Server with the Shadow Redundancy. You can turn off the Shadow Redundancy using the following command in the Exchange Management Shell (EMS).<\/p><pre class=\"wp-block-code command_container\"><code><em>Set-TransportConfig -ShadowRedundancyEnabled $False<\/em><\/code><\/pre><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"511\" height=\"91\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Set-TransportConfig-ShadowRedundancyEnabled-False.png\" alt=\"Set TransportConfig ShadowRedundancyEnabled False\" class=\"wp-image-167838 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Set-TransportConfig-ShadowRedundancyEnabled-False.png 511w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Set-TransportConfig-ShadowRedundancyEnabled-False-300x53.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Set-TransportConfig-ShadowRedundancyEnabled-False-150x27.png 150w\" sizes=\"auto, (max-width: 511px) 100vw, 511px\" \/><\/figure><p>After successful execution of this command, you can restart the transport service.<\/p><pre class=\"wp-block-code command_container\"><code><em>net stop MSExchangeTransport &amp;&amp; net start MSExchangeTransport<\/em><\/code><\/pre><figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"744\" height=\"263\" src=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Enter-the-domain-name-of-the-recipient-and-press-Enter-1.png\" alt=\"Enter the domain name of the recipient and press Enter 1\" class=\"wp-image-167839 apply-gradient-on-post-images\" srcset=\"https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Enter-the-domain-name-of-the-recipient-and-press-Enter-1.png 744w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Enter-the-domain-name-of-the-recipient-and-press-Enter-1-300x106.png 300w, https:\/\/www.stellarinfo.com\/blog\/wp-content\/uploads\/2024\/05\/Enter-the-domain-name-of-the-recipient-and-press-Enter-1-150x53.png 150w\" sizes=\"auto, (max-width: 744px) 100vw, 744px\" \/><\/figure><p>After this, you can check if the issue is resolved.<\/p><h2 class=\"wp-block-heading\" id=\"to-conclude\"><strong>To Conclude<\/strong><\/h2><p>Above, we have mentioned some solutions that you can try to resolve the &ldquo;Server Returned 400 4.4.7 Message Delayed&rdquo; error in Exchange Server. However, the error might also occur due to underlying server issues. In such cases, you may need to reinstall the server or set up a new one. While setting up a new server is straightforward, migrating data to the new server can be a major challenge.<\/p><p>To simplify this process and minimize disruption, you can use a powerful <a href=\"https:\/\/www.stellarinfo.com\/exchange-migration.php\">Exchange server migration tool<\/a> like <strong>Stellar Migrator for Exchange<\/strong>. This application helps you seamlessly migrate primary mailboxes, archive mailboxes, and public folders from the old Exchange Server to a new live Exchange Server or Office 365 tenant. It supports all major Exchange versions and offers an intuitive interface that allows you to browse and select mailbox data for migration with complete control and flexibility.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It is common for users to experience errors and issues when sending&hellip; <a class=\"more-link\" href=\"https:\/\/www.stellarinfo.com\/blog\/fix-server-returned-400-4-4-7-message-delayed-error-in-exchange-server\/\">Continue reading <span class=\"screen-reader-text\">How to Fix \u201cServer Returned 400 4.4.7 Message Delayed\u201d Error in Exchange Server?<\/span><\/a><\/p>\n","protected":false},"author":17,"featured_media":168198,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6218,2960],"tags":[],"class_list":["post-167814","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-exchange-migration","category-migrate-to-office-365","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 Fix \u201cServer Returned 400 4.4.7 Message Delayed\u201d Error in Exchange Server?<\/title>\n<meta name=\"description\" content=\"Resolve &#039;Server Returned 400 4.4 7 Message Delayed&#039; on Exchange Server with our easy-to-follow guide. Fix email delays fast and efficiently!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.stellarinfo.com\/blog\/fix-server-returned-400-4-4-7-message-delayed-error-in-exchange-server\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Fix \u201cServer Returned 400 4.4.7 Message Delayed\u201d Error in Exchange Server?\" \/>\n<meta property=\"og:description\" content=\"Resolve &#039;Server Returned 400 4.4 7 Message Delayed&#039; on Exchange Server with our easy-to-follow guide. 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