{"id":779,"date":"2012-10-25T19:02:59","date_gmt":"2012-10-25T23:02:59","guid":{"rendered":"https:\/\/www.inmotionhosting.com\/support\/2012\/10\/25\/mail-delivery-failed-returning-message-to-sender\/"},"modified":"2025-03-12T12:57:09","modified_gmt":"2025-03-12T16:57:09","slug":"mail-delivery-failed-returning-message-to-sender","status":"publish","type":"post","link":"https:\/\/www.inmotionhosting.com\/support\/email\/mail-delivery-failed-returning-message-to-sender\/","title":{"rendered":"Mail Delivery Failed: Returning Message to Sender"},"content":{"rendered":"<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"538\" src=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2012\/10\/mail-delivery-failed-1024x538.png\" alt=\"Mail Delivery Failed: Returning Message to Sender\" class=\"wp-image-129634\" srcset=\"https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2012\/10\/mail-delivery-failed-1024x538.png 1024w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2012\/10\/mail-delivery-failed-300x158.png 300w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2012\/10\/mail-delivery-failed-768x403.png 768w, https:\/\/www.inmotionhosting.com\/support\/wp-content\/uploads\/2012\/10\/mail-delivery-failed.png 1200w\" sizes=\"auto, (min-width: 1360px) 876px, (min-width: 960px) calc(61.58vw + 51px), calc(100vw - 80px)\" \/><\/figure>\n\n\n\n<p>\u200bWhen you send an email and receive a \u201c<strong>Mail delivery failed: returning message to sender<\/strong>\u201d notification, it indicates that your message was not successfully delivered. This type of notification, known as a bounce or bounce-back message, is automatically generated by mail servers to inform senders of delivery issues.<\/p>\n\n\n\n<p>The bounceback message will have this error in the subject, and the body should contain the original message attempting to be sent. If you know how to review these emails, they will typically tell you what the issue was. For example, the below bounce specifies:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">The following address(es) failed:  <strong>recipient@RemoteDomain.com<\/strong><\/pre>\n\n\n\n<p>We understand it can be challenging to review the entire contents of a returned email message at times, so we created the following tool to help you extract vital information.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"\/support\/tools\/bounce-back-parser\/\">Bounceback Parser Tool<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Example Mail Delivery Failed Message<\/h2>\n\n\n\n<p>For example, here is an email returned to the sender with the headers included.<\/p>\n\n\n\n<p><code>Return-path: &lt;&gt;<br>Envelope-to: <strong>sender@example.com<\/strong><br>Delivery-date: Thu, 25 Oct 2012 16:42:54 -0400<br>Received: from mailnull by ecbiz103.inmotionhosting.com with local (Exim 4.77)<br>id 1TRUGT-0005Qd-RT<br>for <strong>sender@example.com<\/strong>; Thu, 25 Oct 2012 16:42:54 -0400<br>X-Failed-Recipients: <strong>recipient@RemoteDomain.com<\/strong><br>Auto-Submitted: auto-replied<br>From: Mail Delivery System &lt;mailer-daemon@ecbiz103.inmotionhosting.com&gt;<br>To:\u00a0<strong>sender@example.com<\/strong><br>Subject: <strong>Mail delivery failed: returning message to sender<\/strong><br>Message-Id: &lt;e1trugt-0005qd-rt@ecbiz103.inmotionhosting.com&gt;<br>Date: Thu, 25 Oct 2012 16:42:53 -0400&lt;\/e1trugt-0005qd-rt@ecbiz103.inmotionhosting.com&gt;&lt;\/mailer-daemon@ecbiz103.inmotionhosting.com&gt; This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its<br>recipients. This is a permanent error. The following address(es) failed: <strong>recipient@RemoteDomain.com<\/strong><br><strong>No Such User Here<\/strong>\u00a0 ------ This is a copy of the message, including all the headers. ------ Return-path: &lt;<strong>sender@example.com<\/strong>&gt;<br>Received: from <strong>sender@example.com<\/strong> by ecbiz103.inmotionhosting.com with local (Exim 4.77)<br>(envelope-from &lt;<strong>sender@example.com<\/strong>&gt;)<br>id 1TRUGT-0005QT-Q5<br>for <strong>recipient@RemoteDomain.com<\/strong>; Thu, 25 Oct 2012 16:42:53 -0400<br>To:\u00a0<strong>recipient@RemoteDomain.com<\/strong><br>Subject: [example.com] Please moderate: \"About us\"<br>X-PHP-Script: <strong>example.com\/wp-comments-post.php<\/strong> for 123.123.123.123<br>Date: Thu, 25 Oct 2012 20:42:53 +0000<br>From: WordPress &lt;<strong>wordpress@example.com<\/strong>&gt;<br>Message-ID: &lt;82f2c6cb759fb7e7c03356a25c799790@example.com&gt;<br>X-Priority: 3<br>X-Mailer: PHPMailer 5.1 (phpmailer.sourceforge.net)<br>MIME-Version: 1.0<br>Content-Transfer-Encoding: 8bit<br>Content-Type: text\/plain; charset=\"UTF-8\" A new comment on the post \"About us\" is waiting for your approval<br>https:\/\/example.com\/ Author : Payday loans (IP: 123.123.123.123)<br>E-mail : payday@spam.com<br>URL : https:\/\/www.paydayspam.com<br>Comment: Payday loans are available for any occasion!<\/code><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What Caused this Returned Message?<\/h3>\n\n\n\n<p>In the bounceback example above, the cause of the issue is that this user has a WordPress setup to allow comments on posts. A spammer attempted to leave a comment on one of their posts, and this site\u2019s WordPress administrator has set up their e-mail account as\u00a0recipient@RemoteDomain.com. So, that is the address used to send comment moderation requests. However, that e-mail address doesn\u2019t exist on the RemoteDomain.com mail server, so it will always fail and cause a bounce-back error.<\/p>\n\n\n\n<p>Typically, these bounceback errors are hard bounces, meaning trying to send the message again won\u2019t be successful. <span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\">You can read our previous article on\u00a0<a href=\"\" target=\"_blank\">Why Em<\/a><\/span><a href=\"\/support\/email\/email-bounce-bounceback-error\/\">ails Bounce?<\/a>\u00a0for a more in-depth explanation of a hard bounce.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common Causes of Mail Delivery Failure<\/h2>\n\n\n\n<p>Several factors can lead to email delivery failures:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Invalid Recipient Address<\/strong>: The email address you entered may be incorrect or no longer in use. Even minor typographical errors can result in delivery failures.\u200b<\/li>\n\n\n\n<li><strong>Non-Existent Domain<\/strong>: If the domain part of the recipient\u2019s email address (the portion after the \u2018@\u2019 symbol) doesn\u2019t exist or is misspelt, the email cannot be routed correctly.\u200b<\/li>\n\n\n\n<li><strong>Recipient\u2019s Mailbox Full<\/strong>: The recipient\u2019s mailbox has reached its storage limit, preventing new messages from being accepted.\u200b<\/li>\n\n\n\n<li><strong>Spam Filters<\/strong>: The recipient\u2019s mail server might flag your email as spam, leading to rejection or redirection to a spam folder.\u200b<\/li>\n\n\n\n<li><strong>Blacklisted Server<\/strong>: Your email server\u2019s IP address could be blacklisted due to prior spam activities, causing recipient servers to reject emails from your server.\u200b<\/li>\n\n\n\n<li><strong>Attachment Size Limits<\/strong>: The email, including its attachments, exceeds the size limit set by the recipient\u2019s email server.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Understanding Bounce Messages<\/h2>\n\n\n\n<p>Bounce messages provide specific information about why an email wasn\u2019t delivered. Key components include: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Error Codes<\/strong>: Numeric codes indicating the type of error. For example, \u2018550\u2019 typically means the mailbox is unavailable.<\/li>\n\n\n\n<li><strong>Error Messages<\/strong>: Descriptions accompanying the error codes, such as \u201cNo Such User Here,\u201d indicating the recipient address is invalid.<\/li>\n<\/ul>\n\n\n\n<p>Reviewing these details can help identify the exact cause of delivery failure.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Steps to Resolve Delivery Failures<\/h2>\n\n\n\n<p>To address email delivery issues: <\/p>\n\n\n\n<p><strong>Verify Recipient Address<\/strong>: Ensure the email address is correct and active.\u200b<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Check Domain Validity<\/strong>: Confirm that the domain in the email address is valid and correctly spelled.\u200b<\/li>\n\n\n\n<li><strong>Resend Later<\/strong>: If the recipient\u2019s mailbox is full, wait and try sending the email again later.<\/li>\n\n\n\n<li><strong>Review Email Content<\/strong>: Avoid content that might trigger spam filters, such as excessive links or suspicious phrases.\u200b<\/li>\n\n\n\n<li><strong>Monitor Server Reputation<\/strong>: Regularly check if your email server\u2019s IP is blacklisted and take necessary actions to delist it.\u200b<\/li>\n\n\n\n<li><strong>Reduce Attachment Size<\/strong>: Compress large attachments or use file-sharing services to send large files.<\/li>\n<\/ol>\n\n\n\n<p>Since server issues can cause this error, asking the person you are sending it to can be helpful if they have any other related problems.<\/p>\n\n\n\n<p>If you also have<span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\"> issues with WordPress comment spam causing bounce-back errors for your account, we have an advanced article on\u00a0<a href=\"https:\/\/www.inmotionhosting.com\/support\/edu\/wordpress\/wordpress-comment-spam\/\" target=\"_blank\" rel=\"noreferrer noopener\">cleaning up WordPress comment spam<\/a>\u00a0that could help you resolve this issue<\/span>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Preventing Future Delivery Issues<\/h2>\n\n\n\n<p>To minimize future email delivery problems:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Maintain a Clean Mailing List<\/strong>: Regularly update your contact list to remove invalid or inactive email addresses.\u200b<\/li>\n\n\n\n<li><strong>Authenticate Emails<\/strong>: Implement email authentication protocols like SPF, DKIM, and DMARC to enhance email deliverability and reduce the likelihood of your emails being marked as spam.\u200b<\/li>\n\n\n\n<li><strong>Monitor Bounce Rates<\/strong>: Keep an eye on bounce rates to promptly identify and address potential issues.<\/li>\n<\/ul>\n\n\n\n<p>By understanding the causes of email delivery failures and taking proactive measures, you can improve the success rate of your email communications.<\/p>\n\n\n<div class=\"jumbotron\" style=\"text-align:center;\">\r\n<p style=\"font-size: 20px;\"><strong>Scalable VPS Infrastructure, Fully Managed<\/strong><\/p>\r\n<p>When shared hosting can't handle your traffic, VPS delivers dedicated resources that scale with demand. Our team manages the technical complexity while you manage your business.<\/p>\r\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/design.inmotionhosting.com\/assets\/icons\/standard\/check-blue.svg\" alt=\"check mark\" width=\"24\" height=\"24\" \/>NVMe Storage &nbsp;&nbsp; <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/design.inmotionhosting.com\/assets\/icons\/standard\/check-blue.svg\" alt=\"check mark\" width=\"24\" height=\"24\" \/>High-Availability &nbsp;&nbsp; <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/design.inmotionhosting.com\/assets\/icons\/standard\/check-blue.svg\" alt=\"check mark\" width=\"24\" height=\"24\" \/>Ironclad Security &nbsp;&nbsp; <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/design.inmotionhosting.com\/assets\/icons\/standard\/check-blue.svg\" alt=\"check mark\" width=\"24\" height=\"24\" \/>Premium Support<\/p>\r\n<p><a class=\"btn btn-primary btn-lg\" href=\"https:\/\/www.inmotionhosting.com\/vps-hosting?mktgp=t&irgwc=1&affiliates=5001860&utm_campaign=Jumbotron&utm_source=supportcenter&utm_medium=cta&utm_term=vps-cta2\">VPS Hosting<\/a><\/p>\r\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u200bWhen you send an email and receive a &#8220;Mail delivery failed: returning message to sender&#8221; notification, it indicates that your message was not successfully delivered. This type of notification, known as a bounce or bounce-back message, is automatically generated by mail servers to inform senders of delivery issues. The bounceback message will have this error<a class=\"moretag\" href=\"https:\/\/www.inmotionhosting.com\/support\/email\/mail-delivery-failed-returning-message-to-sender\/\"> Read More ><\/a><\/p>\n","protected":false},"author":57014,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-779","post","type-post","status-publish","format-standard","hentry","category-email"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mail Delivery Failed: Returning Message to Sender<\/title>\n<meta name=\"description\" content=\"Learn about common reasons for &quot;Mail delivery failed&quot; notifications and discover practical steps to resolve and prevent email delivery issues.\" \/>\n<meta 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