{"id":34677,"date":"2026-06-09T10:16:27","date_gmt":"2026-06-09T10:16:27","guid":{"rendered":"https:\/\/1grid.co.za\/knowledge\/?post_type=ht_kb&#038;p=34677"},"modified":"2026-06-09T10:48:08","modified_gmt":"2026-06-09T10:48:08","slug":"smtp-error-551-invalid-or-relocated-recipient-how-to-fix","status":"publish","type":"ht_kb","link":"https:\/\/1grid.co.za\/knowledge\/smtp-error-551-invalid-or-relocated-recipient-how-to-fix\/","title":{"rendered":"SMTP Error 551: Invalid or Relocated Recipient (How to Fix)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">If your email fails with <strong>SMTP Error 551<\/strong>, the receiving server is telling you that the <strong>recipient address is invalid, moved, or not hosted on that server.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide will help you:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-understand-why-the-error-occurs\">Understand why the error occurs<\/li>\n\n\n\n<li id=\"htoc-identify-the-exact-cause-of-the-rejection\">Identify the exact cause of the rejection<\/li>\n\n\n\n<li id=\"htoc-fix-the-issue-quickly\">Fix the issue quickly<\/li>\n\n\n\n<li id=\"htoc-restore-successful-email-delivery\">Restore successful email delivery<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">In most cases, this error simply means the <strong>recipient email address needs to be corrected or updated.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">By the end of this guide, you\u2019ll confidently diagnose and resolve SMTP 551 errors without unnecessary support escalation.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"600\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2026\/06\/1-grid-Images-for-KB-Articles-1000-x-600-px-21.png\" alt=\"SMTP Error 551: Invalid or Relocated Recipient (How to Fix)\" class=\"wp-image-34679\"\/><\/figure>\n<\/div>\n\n\n<div class=\"wp-block-ht-block-toc is-style-rounded htoc htoc--position-wide toc-list-style-plain\" data-htoc-state=\"expanded\"><span class=\"htoc__title\"><span class=\"ht_toc_title\">Quick Links<\/span><span class=\"htoc__toggle\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"16\" height=\"16\"><g fill=\"#444\"><path d=\"M15 7H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1z\"><\/path><path d=\"M15 1H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1zM15 13H1c-.6 0-1 .4-1 1s.4 1 1 1h14c.6 0 1-.4 1-1s-.4-1-1-1z\"><\/path><\/g><\/svg><\/span><\/span><div class=\"htoc__itemswrap\"><ul class=\"ht_toc_list\"><li class=\"\"><a href=\"#htoc-step-by-step-fix-for-smtp-551-error-invalid-or-relocated-recipient\">Step-by-Step Fix for SMTP 551 Error \u2013 Invalid or Relocated Recipient<\/a><\/li><li class=\"\"><a href=\"#htoc-quick-fixes-for-common-smtp-554-variations\">Quick Fixes for Common SMTP 554 Variations&nbsp;<\/a><\/li><\/ul><\/div><\/div>\n\n\n\n<h2 id=\"htoc-what-smtp-error-551-means\" class=\"wp-block-heading\">What SMTP Error 551 Means<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SMTP Error 551 is a <strong>permanent delivery failure (<a href=\"https:\/\/1grid.co.za\/knowledge\/why-emails-bounce-back-error-messages-and-how-to-fix-them\/#htoc-hard-bounce-permanent-failure\" target=\"_blank\" rel=\"noreferrer noopener\">hard bounce<\/a>)<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It usually occurs when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-the-recipient-email-address-no-longer-exists\">The recipient email address <strong>no longer exists<\/strong><\/li>\n\n\n\n<li id=\"htoc-the-mailbox-has-moved-to-another-server\">The mailbox has <strong>moved to another server<\/strong><\/li>\n\n\n\n<li id=\"htoc-the-address-belongs-to-another-domain\">The address belongs to <strong>another domain<\/strong><\/li>\n\n\n\n<li id=\"htoc-the-mail-server-refuses-to-relay-the-message\">The mail server refuses to <strong>relay the message<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Because it is a <strong>hard bounce<\/strong>, the sending server will <strong>not retry delivery automatically.<\/strong><\/p>\n\n\n\n<h2 id=\"htoc-why-this-matters\" class=\"wp-block-heading\">Why This Matters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ignoring <strong>SMTP Error 551<\/strong> may lead to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-repeated-permanent-delivery-failures-hard-bounces\">Repeated <strong>permanent delivery failures (hard bounces)<\/strong><\/li>\n\n\n\n<li id=\"htoc-important-emails-never-reaching-the-intended-recipient\">Important emails <strong>never reaching the intended recipient<\/strong><\/li>\n\n\n\n<li id=\"htoc-outdated-contacts-remaining-in-mailing-lists-or-crm-systems\"><strong>Outdated contacts remaining in mailing lists or CRM systems<\/strong><\/li>\n\n\n\n<li id=\"htoc-reduced-sender-reputation-if-invalid-addresses-continue-receiving-mail\">Reduced <strong>sender reputation<\/strong> if invalid addresses continue receiving mail<\/li>\n\n\n\n<li id=\"htoc-unnecessary-support-tickets-when-the-issue-is-simply-an-incorrect-or-relocated-address\"><strong>Unnecessary support tickets<\/strong> when the issue is simply an incorrect or relocated address<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Because <strong>SMTP 551 is a permanent rejection<\/strong>, the mail server will <strong>not retry delivery automatically<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Correctly identifying the reason for the 551 response ensures you <strong>update the recipient address or routing information<\/strong>, allowing future emails to be delivered successfully.<\/p>\n\n\n\n<h2 id=\"htoc-step-by-step-fix-for-smtp-551-error-invalid-or-relocated-recipient\" class=\"wp-block-heading\"><strong>Step-by-Step Fix for SMTP 551 Error \u2013 Invalid or Relocated Recipient<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Follow these steps in order.<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>1: Confirm the Full Error Message<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-open-the-bounce-notification-and-confirm-it-includes-variations-such-as\">Open the bounce notification and confirm it includes variations such as:<\/p>\n\n\n\n<pre id=\"htoc-551-user-not-local\" class=\"wp-block-code\"><code>551 User not local\n551 not our customer\n551 5.1.1 user does not exist\n551 recipient address failed to route\n551 relay request denied\n551 User not local; please try &lt;forward-path&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-the-extended-message-often-explains-why-the-receiving-server-cannot-deliver-the-email\">The extended message often explains <strong>why the receiving server cannot deliver the email<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-smtp-551-typically-indicates-the-recipient-mailbox-does-not-exist-on-that-server-or-has-been-moved-elsewhere\">SMTP 551 typically indicates the <strong>recipient mailbox does not exist on that server or has been moved elsewhere<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-if-a-different-smtp-code-appears-refer-to-the-smtp-error-codes-guide\">If a different SMTP code appears, refer to the <strong><a href=\"https:\/\/1grid.co.za\/knowledge\/a-guide-to-smtperror-codes\/\" target=\"_blank\" rel=\"noreferrer noopener\">SMTP Error Codes<\/a> <\/strong>guide.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>2: Check the Recipient Email Address<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-the-most-common-cause-is-typing-mistakes\">The most common cause is<strong> typing mistakes.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-verify\"><strong>Verify:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-spelling-of-the-mailbox-name\">Spelling of the mailbox name<\/li>\n\n\n\n<li id=\"htoc-domain-name\">Domain name<\/li>\n\n\n\n<li id=\"htoc-extra-spaces-or-characters\">Extra spaces or characters<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-example\"><strong>Example:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-incorrect-john-smith-gmial-com\">Incorrect: <a href=\"mailto:john.smith@gmial.com\">john.smith@gmial.com<\/a><\/li>\n\n\n\n<li id=\"htoc-correct-john-smith-gmail-com\">Correct: <a href=\"mailto:john.smith@gmail.com\">john.smith@gmail.com<\/a><\/li>\n<\/ul>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>3: Confirm the Address Still Exists<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-ometimes-recipients\">Sometimes recipients:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-delete-old-mailboxes\">Delete old mailboxes<\/li>\n\n\n\n<li id=\"htoc-change-email-providers\">Change email providers<\/li>\n\n\n\n<li id=\"htoc-move-to-new-domains\">Move to new domains<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-contact-the-recipient-through-another-method-and-confirm-the-correct-address\">Contact the recipient through another method and confirm the correct address.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>4: Update Saved Contacts or Mailing Lists<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-if-the-address-exists-in\">If the address exists in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-address-books\">Address books<\/li>\n\n\n\n<li id=\"htoc-mailing-lists\">Mailing lists<\/li>\n\n\n\n<li id=\"htoc-crm-systems\">CRM systems<\/li>\n\n\n\n<li id=\"htoc-newsletter-platforms\">Newsletter platforms<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-update-the-contact-record-to-prevent-future-delivery-failures\">Update the contact record to prevent future delivery failures.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>5: Remove Invalid Recipients from Bulk Emails<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-if-you-re-sending-emails-to-many-recipients-remove-addresses-that-generate-smtp-551-errors\">If you&#8217;re sending emails to many recipients, remove addresses that generate <strong>SMTP 551 errors.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-continuing-to-send-to-invalid-addresses-can-negatively-affect-your-email-reputation\">Continuing to send to invalid addresses can negatively affect your <strong>email reputation.<\/strong><\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>6: Review Delivery Logs (Basic Level)<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-log-in-to\">Log in to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-cpanel-email-track-delivery\"><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-log-in-to-cpanel-via-your-1-grid-customer-zone\/\" target=\"_blank\" rel=\"noreferrer noopener\">cPanel<\/a>&nbsp;<\/strong>\u2192 Email \u2192&nbsp;<strong><a href=\"https:\/\/1grid.co.za\/knowledge\/cpanel-how-to-view-delivery-reports-via-track-delivery\/\" target=\"_blank\" rel=\"noreferrer noopener\">Track Delivery<\/a>&nbsp;<\/strong><\/li>\n\n\n\n<li id=\"htoc-plesk-websites-amp-domains-select-your-domain-mail-track-email-delivery\"><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/plesk-how-do-i-login-via-customer-zone\/\" target=\"_blank\" rel=\"noreferrer noopener\">Plesk<\/a>&nbsp;<\/strong>\u2192&nbsp;Websites &amp; Domains \u2192 Select your domain \u2192 Mail \u2192 Track Email Delivery&nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-confirm\">Confirm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-the-message-was-permanently-rejected-with-a-551-response\">The message was <strong>permanently rejected with a 551 response<\/strong><\/li>\n\n\n\n<li id=\"htoc-the-recipient-server-returned-a-routing-or-user-location-error\">The <strong>recipient server returned a routing or user-location error<\/strong><\/li>\n\n\n\n<li id=\"htoc-the-exact-timestamp-and-server-response-message\">The <strong>exact timestamp and server response message<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-delivery-logs-help-verify-whether-the-problem-is-caused-by\">Delivery logs help verify whether the problem is caused by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-a-non-existent-mailbox\">A <strong>non-existent mailbox<\/strong><\/li>\n\n\n\n<li id=\"htoc-a-recipient-that-moved-to-another-server-or-domain\">A <strong>recipient that moved to another server or domain<\/strong><\/li>\n\n\n\n<li id=\"htoc-relay-restrictions-or-routing-configuration-on-the-recipient-server\"><strong>Relay restrictions or routing configuration on the recipient server<\/strong><\/li>\n<\/ul>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>7: Resend the Email<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-once-the-correct-address-is-confirmed\">Once the correct address is confirmed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-resend-the-email\">Resend the email.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-delivery-should-be-completed-successfully\">Delivery should be completed successfully.<\/p>\n<\/details>\n\n\n\n<h2 id=\"htoc-quick-fixes-for-common-smtp-554-variations\" class=\"wp-block-heading\">Quick Fixes for Common SMTP 554 Variations&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SMTP 551 is a <strong>permanent delivery failure (\u201chard bounce\u201d)<\/strong>. This means the receiving server refused the message because the recipient mailbox is invalid, has moved, or is not hosted on that server.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike temporary errors (4xx), <strong>SMTP 551 requires action before the email can be resent successfully.<\/strong><\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>1. 551 User Not Local<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-example-551-user-not-local551-user-not-local-please-try-lt-forward-path-gt-551-recipient-is-not-local\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre id=\"htoc-example-551-user-not-local551-user-not-local-please-try-lt-forward-path-gt-551-recipient-is-not-local1\" class=\"wp-block-code\"><code>551 User not local\n551 user not local; please try &lt;forward-path&gt;\n551 recipient is not local<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-what-it-means-the-receiving-mail-server-does-not-host-the-mailbox-you-are-trying-to-send-to-it-simply-means-the-destination-mailbox-is-not-located-on-that-server\"><strong>What It Means:<\/strong><br>The receiving mail server does not host the mailbox you are trying to send to. It simply means the destination mailbox is not located on that server.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-this-typically-happens-when\"><strong>When This Typically Happens:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-the-mailbox-moved-to-another-server\">The mailbox moved to another server<\/li>\n\n\n\n<li id=\"htoc-the-email-address-belongs-to-another-domain\">The email address belongs to another domain<\/li>\n\n\n\n<li id=\"htoc-the-address-was-changed-or-migrated\">The address was changed or migrated<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-how-to-fix-it\"><strong>How to Fix It:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-confirm-the-correct-email-address-with-the-recipient\">Confirm the correct email address with the recipient<\/li>\n\n\n\n<li id=\"htoc-ask-if-their-email-provider-or-domain-recently-changed\">Ask if their email provider or domain recently changed<\/li>\n\n\n\n<li id=\"htoc-update-the-address-in-your-contacts-or-mailing-lists\">Update the address in your contacts or mailing lists<\/li>\n\n\n\n<li id=\"htoc-resend-the-message-using-the-correct-address\">Resend the message using the correct address<\/li>\n<\/ul>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>2. 551 Not Our Customer<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-example1\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre id=\"htoc-551-not-our-customer-551-mailbox-not-hosted-here-551-domain-does-not-handle-this-recipient\" class=\"wp-block-code\"><code>551 not our customer\n551 mailbox not hosted here\n551 domain does not handle this recipient<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-what-it-means-the-receiving-server-recognizes-the-domain-but-does-not-manage-mail-for-the-specific-recipient-this-error-only-affects-delivery-to-that-specific-address-and-does-not-impact-your-hosting-services\"><strong>What It Means:<\/strong><br>The receiving server recognises the domain but does not manage mail for the specific recipient. This error only affects delivery to that specific address and does not impact your hosting services.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-when-this-occurs\"><strong>When This Occurs:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-the-mailbox-was-deleted\">The mailbox was deleted<\/li>\n\n\n\n<li id=\"htoc-the-domain-changed-email-providers\">The domain changed email providers<\/li>\n\n\n\n<li id=\"htoc-the-recipient-address-is-outdated\">The recipient address is outdated<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-how-to-fix-it1\"><strong>How to Fix It:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-verify-the-email-address-spelling\">Verify the email address spelling<\/li>\n\n\n\n<li id=\"htoc-confirm-the-recipient-still-uses-that-mailbox\">Confirm the recipient still uses that mailbox<\/li>\n\n\n\n<li id=\"htoc-ask-for-an-updated-email-address\">Ask for an updated email address<\/li>\n\n\n\n<li id=\"htoc-update-saved-contact-records\">Update saved contact records<\/li>\n<\/ul>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>3. 551 Relay Access Denied<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-example-551-relay-access-denied551-this-is-not-a-relay-host551-mail-must-be-to-or-from-local-domain\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre id=\"htoc-example-551-relay-access-denied551-this-is-not-a-relay-host551-mail-must-be-to-or-from-local-domain1\" class=\"wp-block-code\"><code>551 Relay access denied\n551 This is not a relay host\n551 mail must be to or from local domain<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-what-it-means-the-receiving-mail-server-does-not-allow-messages-to-be-relayed-through-it\"><strong>What It Means:<\/strong><br>The receiving mail server does not allow messages to be relayed through it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-this-may-happen-if\"><strong>When This May Happen:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-the-message-is-routed-incorrectly\">The message is routed incorrectly<\/li>\n\n\n\n<li id=\"htoc-the-server-refuses-to-forward-mail-to-external-domains\">The server refuses to forward mail to external domains<\/li>\n\n\n\n<li id=\"htoc-smtp-relay-policies-block-the-request\">SMTP relay policies block the request<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-how-to-fix-it11\"><strong>How to Fix It:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-confirm-the-recipient-email-domain-is-correct\">Confirm the recipient email domain is correct<\/li>\n\n\n\n<li id=\"htoc-ensure-your-smtp-server-settings-are-configured-correctly\">Ensure your SMTP server settings are configured correctly<\/li>\n\n\n\n<li id=\"htoc-verify-smtp-authentication-is-enabled-if-required\">Verify SMTP authentication is enabled if required<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-this-does-not-mean-your-account-is-blocked-it-simply-indicates-that-the-receiving-server-will-not-relay-the-message\">This does not mean your account is blocked. It simply indicates that the receiving server will not relay the message.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>4. 551 Recipient Does Not Exist<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-example-551-5-1-1-recipient-does-not-exist551-unknown-user551-user-not-found\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre id=\"htoc-example-551-5-1-1-recipient-does-not-exist551-unknown-user551-user-not-found1\" class=\"wp-block-code\"><code>551 5.1.1 recipient does not exist\n551 unknown user\n551 user not found<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-what-it-means-the-email-address-does-not-exist-on-the-destination-mail-server\"><strong>What It Means:<\/strong><br>The email address does not exist on the destination mail server.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-this-usually-occurs-when\"><strong>When This Usually Occurs: <\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-the-mailbox-was-deleted1\">The mailbox was deleted<\/li>\n\n\n\n<li id=\"htoc-the-address-was-entered-incorrectly\">The address was entered incorrectly<\/li>\n\n\n\n<li id=\"htoc-the-recipient-organization-removed-the-account\">The recipient organisation removed the account<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-how-to-fix-it111\"><strong>How to Fix It:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-double-check-the-spelling-of-the-email-address\">Double-check the spelling of the email address<\/li>\n\n\n\n<li id=\"htoc-confirm-the-mailbox-is-still-active\">Confirm the mailbox is still active<\/li>\n\n\n\n<li id=\"htoc-request-an-alternative-contact-address-if-needed\">Request an alternative contact address if needed<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-this-error-only-affects-that-specific-email-address-and-does-not-impact-your-email-service-or-domain\">This error only affects that specific email address and does not impact your email service or domain.<\/p>\n<\/details>\n\n\n\n<h1 id=\"htoc-advanced-optional-fixes-for-technical-users\" class=\"wp-block-heading\">Advanced (Optional) Fixes (For Technical Users)<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Administrators, or Technical Users can diagnose routing problems using the following checks.<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>1. Verify Recipient Mail Routing<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-use-dns-lookup-tools-to-confirm-the-recipient-domain-s-mx-records\">Use DNS lookup tools to confirm the recipient domain&#8217;s <strong>MX records<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-example11\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre id=\"htoc-nslookup-type-mx-example-com\" class=\"wp-block-code\"><code>nslookup -type=mx example.com<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-this-shows-which-servers-handle-mail-for-that-domain\">This shows which servers handle mail for that domain.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>2. Check SMTP Logs<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-mail-server-logs-may-show-detailed-routing-errors\">Mail server logs may show detailed routing errors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-example111\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre id=\"htoc-551-user-not-local551-relay-access-denied\" class=\"wp-block-code\"><code>551 user not local<br>551 relay access denied<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-logs-help-confirm-whether-the-issue-is-address-related-or-routing-related\">Logs help confirm whether the issue is <strong>address-related or routing-related.<\/strong><\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>3. Confirm SMTP Relay Configuration<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-if-the-error-is-relay-access-denied-verify\">If the error is <strong>Relay Access Denied<\/strong>, verify:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-smtp-authentication-enabled\">SMTP authentication enabled<\/li>\n\n\n\n<li id=\"htoc-correct-smtp-server\">Correct SMTP server<\/li>\n\n\n\n<li id=\"htoc-proper-port-configuration\">Proper port configuration<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-common-smtp-ports\"><strong>Common SMTP Ports:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-587\">587<\/li>\n\n\n\n<li id=\"htoc-465\">465<\/li>\n\n\n\n<li id=\"htoc-25\">25<\/li>\n<\/ul>\n<\/details>\n\n\n\n<h2 id=\"htoc-before-you-move-on\" class=\"wp-block-heading\">Before You Move On<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Confirm:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-confirm-the-recipient-address-is-correct\">Confirm the recipient address is correct<\/li>\n\n\n\n<li id=\"htoc-verify-the-mailbox-still-exists\">Verify the mailbox still exists<\/li>\n\n\n\n<li id=\"htoc-update-saved-contacts-or-mailing-lists\">Update saved contacts or mailing lists<\/li>\n\n\n\n<li id=\"htoc-remove-invalid-recipients-from-bulk-emails\">Remove invalid recipients from bulk emails<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Then resend the message.<\/p>\n\n\n\n<h2 id=\"htoc-if-this-didn-t-work\" class=\"wp-block-heading\">If This Didn\u2019t Work<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Try the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-contact-the-recipient-to-confirm-their-new-email-address\">Contact the recipient to confirm their new email address<\/li>\n\n\n\n<li id=\"htoc-check-whether-the-domain-has-changed\">Check whether the domain has changed<\/li>\n\n\n\n<li id=\"htoc-verify-your-smtp-settings-if-relay-errors-appear\">Verify your SMTP settings if relay errors appear<\/li>\n\n\n\n<li id=\"htoc-review-the-full-bounce-message-for-additional-clues\">Review the full bounce message for additional clues<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If the problem continues, contact support and provide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-full-bounce-message\">Full bounce message<\/li>\n\n\n\n<li id=\"htoc-sender-email-address\">Sender email address<\/li>\n\n\n\n<li id=\"htoc-recipient-email-address\">Recipient email address<\/li>\n\n\n\n<li id=\"htoc-date-and-time-the-message-was-sent\">Date and time the message was sent<\/li>\n<\/ul>\n\n\n\n<h2 id=\"htoc-common-mistakes-to-avoid\" class=\"wp-block-heading\">Common Mistakes to Avoid<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-sending-repeatedly-to-an-invalid-address\">Sending repeatedly to an invalid address<\/li>\n\n\n\n<li id=\"htoc-ignoring-bounce-messages\">Ignoring bounce messages<\/li>\n\n\n\n<li id=\"htoc-using-outdated-mailing-lists\">Using outdated mailing lists<\/li>\n\n\n\n<li id=\"htoc-assuming-the-issue-is-server-side\">Assuming the issue is server-side<\/li>\n<\/ul>\n\n\n\n<h2 id=\"htoc-empowering-insight\" class=\"wp-block-heading\">Empowering Insight<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"300\" src=\"https:\/\/1grid.co.za\/knowledge\/wp-content\/uploads\/2026\/03\/1-grid-Images-for-KB-Articles-1000-x-600-px-1600-x-300-px.png\" alt=\"Empowering Insight\" class=\"wp-image-34464\"\/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">Email errors like <strong>SMTP 551 usually indicate a simple contact problem, not a server failure.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Updating the correct recipient address typically restores delivery immediately.<\/p>\n\n\n\n<h2 id=\"htoc-faqs\" class=\"wp-block-heading\">FAQs<\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q. Why did the address stop working?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-q-why-did-the-address-stop-working-possible-reasons-include\">Possible reasons include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-the-mailbox-was-deleted11\">The mailbox was deleted<\/li>\n\n\n\n<li id=\"htoc-the-recipient-changed-email-providers\">The recipient changed email providers<\/li>\n\n\n\n<li id=\"htoc-the-domain-moved-to-another-mail-server\">The domain moved to another mail server<\/li>\n<\/ul>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q. Will the email resend automatically?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-q-will-the-email-resend-automatically-no-as-this-is-a-hard-bounce-the-sending-server-will-not-retry-automatically\">No, as this is a hard bounce, the sending server will not retry automatically.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q. Can I undo this error?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-q-can-i-undo-this-error-yes-once-the-correct-recipient-address-is-used-email-delivery-should-work-normally\">Yes, once the correct recipient address is used, email delivery should work normally.<\/p>\n<\/details>\n\n\n\n<h2 id=\"htoc-additional-resources\" class=\"wp-block-heading\">Additional Resources<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/a-guide-to-smtperror-codes\/\" target=\"_blank\" rel=\"noreferrer noopener\">SMTP Error Codes<\/a>&nbsp;&nbsp;<\/strong><br><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-enable-dkim-and-spf-on-your-mail-domain\/\" target=\"_blank\" rel=\"noreferrer noopener\">SPF\/DKIM Setup Guide<\/a>&nbsp;<\/strong>&nbsp;<br><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/email-restrictions\/\" target=\"_blank\" rel=\"noreferrer noopener\">Email Sending Limits Guide<\/a>&nbsp;<\/strong>&nbsp;<br><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/why-emails-bounce-back-error-messages-and-how-to-fix-them\/\" target=\"_blank\" rel=\"noreferrer noopener\">Email Bounce Back Guide<\/a>&nbsp;<\/strong><\/p>\n\n\n\n<h2 id=\"htoc-need-additional-support\" class=\"wp-block-heading\">Need Additional Support?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>We&#8217;re Here to <\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/\"><strong>Help<\/strong><\/a><strong>:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Understanding SMTP Error 551 and how to fix this doesn\u2019t have to feel technical with this easy-to-reference guide. Stuck? Check out our <a href=\"https:\/\/1grid.co.za\/knowledge\/1-grid-scope-of-support\/\"><strong>Scope of Support<\/strong><\/a>, and then contact our Support Team for further clarity and guidance (<a href=\"https:\/\/1grid.co.za\/contact-us\/\"><strong>https:\/\/1grid.co.za\/contact-us\/<\/strong><\/a>). We&#8217;re ready to see how we can help!<a id=\"_msocom_1\"><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If your email fails with SMTP Error 551, the receiving server is telling you that the recipient address is invalid, moved, or not hosted on that server. This guide will help you: In most cases, this error simply means the recipient email address needs to be corrected or updated. By&#8230;<\/p>\n","protected":false},"author":21,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"ht-kb-category":[1194],"ht-kb-tag":[1764,1762,1765,1766,1706,1763,1701],"class_list":["post-34677","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-email-troubleshooting","ht_kb_tag-551-relay-denied","ht_kb_tag-551-user-not-local","ht_kb_tag-email-bounce-error","ht_kb_tag-recipient-moved-email","ht_kb_tag-smtp-bounce-errors","ht_kb_tag-smtp-error-551","ht_kb_tag-smtp-errors"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SMTP Error 551: Invalid or Relocated Recipient (How to Fix) - 1-grid Knowledge Base<\/title>\n<meta name=\"description\" content=\"Fix SMTP Error 551 email delivery failures. 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