{"id":34551,"date":"2026-03-17T12:02:40","date_gmt":"2026-03-17T12:02:40","guid":{"rendered":"https:\/\/1grid.co.za\/knowledge\/?post_type=ht_kb&#038;p=34551"},"modified":"2026-03-25T11:33:57","modified_gmt":"2026-03-25T11:33:57","slug":"smtp-error-553-no-such-user-here-how-to-fix","status":"publish","type":"ht_kb","link":"https:\/\/1grid.co.za\/knowledge\/smtp-error-550-no-such-user-here-how-to-fix\/","title":{"rendered":"SMTP Error 550: No Such User Here (How to Fix)"},"content":{"rendered":"\n<p>SMTP Error&nbsp;<strong>550: No Such User Here<\/strong>&nbsp;means the recipient\u2019s mail server could not find the email address you are trying to send to.&nbsp;<\/p>\n\n\n\n<p>This guide will help you understand why the error occurs, identify&nbsp;the exact cause, fix the issue quickly, and restore successful email delivery.&nbsp;<\/p>\n\n\n\n<p>In most cases, the problem is simple to resolve and&nbsp;<strong>does not affect your website, hosting account, or domain functionality.<\/strong>&nbsp;<\/p>\n\n\n\n<p>By the end of this guide,&nbsp;you\u2019ll&nbsp;confidently diagnose and resolve SMTP&nbsp;550&nbsp;errors without unnecessary support escalation.&nbsp;<\/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\/03\/1-grid-Images-for-KB-Articles-1000-x-600-px-10.png\" alt=\"SMTP Error 550: No Such User Here (How to Fix) \" class=\"wp-image-34552\"\/><\/figure>\n<\/div>\n\n\n<div class=\"wp-block-ht-block-toc  is-style-outline 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-what-smtp-error-550-means\">What SMTP Error&nbsp;550&nbsp;Means&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-why-this-matters\">Why This&nbsp;Matters&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-step-by-step-fix-for-smtp-550-error-no-such-user-here\">Step-by-Step Fix for&nbsp;SMTP&nbsp;550&nbsp;Error&nbsp;\u2013&nbsp;No Such User Here&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-quick-fixes-for-common-smtp-550-variations\">Quick&nbsp;Fixes for Common SMTP 550&nbsp;Variations&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-advanced-optional-fixes-for-technical-users\">Advanced&nbsp;(Optional)&nbsp;Fixes&nbsp;(For Technical Users)&nbsp;<\/a><\/li><\/ul><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-what-smtp-error-550-means\"><strong>What SMTP Error&nbsp;550&nbsp;Means<\/strong>&nbsp;<\/h2>\n\n\n\n<p>SMTP Error&nbsp;<strong>550<\/strong>&nbsp;is a&nbsp;<strong>permanent delivery failure (hard bounce).<\/strong>&nbsp;<\/p>\n\n\n\n<p>This means the <span style=\"box-sizing: border-box; margin: 0px; padding: 0px;\">recipient<a href=\"https:\/\/1grid.co.za\/knowledge\/smtp-error-550-message-rejected-by-server-how-to-fix-it\/\" target=\"_blank\"><strong>\u00a0server<\/strong><\/a><\/span><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/smtp-error-550-message-rejected-by-server-how-to-fix-it\/\"> rejected the message<\/a><\/strong> and will\u00a0<strong>not retry delivery automatically.<\/strong>\u00a0<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Common Error Examples<\/strong><\/summary>\n<pre id=\"htoc-common-error-examples-include\" class=\"wp-block-code\"><code>550 No Such User Here&nbsp;\n550 Invalid Recipient&nbsp;\n550 User Unknown&nbsp;\n550 Mailbox Unavailable&nbsp;\n550 Recipient Not Found&nbsp;<\/code><\/pre>\n<\/details>\n\n\n\n<p>The receiving mail server&nbsp;indicates&nbsp;that&nbsp;<strong>the mailbox does not exist or cannot be&nbsp;located.<\/strong>&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-why-this-matters\"><strong>Why This&nbsp;Matters<\/strong>&nbsp;<\/h2>\n\n\n\n<p>Correctly\u00a0identifying\u00a0the cause ensures the email can be delivered successfully.\u00a0<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>The Impact of Ignoring 550 Errors\u00a0<\/strong><\/summary>\n<p id=\"htoc-ignoring-550-errors-may-lead-to\">This may lead to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Emails permanently failing\u00a0<\/li>\n\n\n\n<li>Broken communication with clients\u00a0<\/li>\n\n\n\n<li>Mailing list delivery failures\u00a0<\/li>\n\n\n\n<li>Confusion over bounced messages\u00a0<\/li>\n<\/ul>\n<\/details>\n\n\n\n<ul class=\"wp-block-list\"><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-step-by-step-fix-for-smtp-550-error-no-such-user-here\"><strong>Step-by-Step Fix for&nbsp;SMTP&nbsp;550&nbsp;Error&nbsp;\u2013&nbsp;No Such User Here<\/strong>&nbsp;<\/h2>\n\n\n\n<p>Follow these steps in order.&nbsp;<\/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&nbsp;<\/strong><\/summary>\n<p id=\"htoc-open-the-bounce-notification-and-confirm-it-includes-variations-such-as\">Open the bounce notification and confirm it includes variations such as:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-550-no-such-user-here-550-invalid-recipient-550-user-unknown-550-mailbox-unavailable\" class=\"wp-block-code\"><code>550 No such user here&nbsp;\n550 Invalid recipient&nbsp;\n550 User unknown&nbsp;\n550 Mailbox unavailable&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-if-a-different-smtp-code-appears-refer-to-the-smtp-error-codes-guide\">If a different&nbsp;SMTP code appears, refer to&nbsp;the <a href=\"https:\/\/1grid.co.za\/knowledge\/a-guide-to-smtperror-codes\/\"><strong>SMTP Error Codes<\/strong><\/a>&nbsp;guide.&nbsp;<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>2: Verify the Recipient Email Address&nbsp;<\/strong><\/summary>\n<p id=\"htoc-check-the-recipient-s-address-carefully\">Check the&nbsp;recipient&#8217;s&nbsp;address carefully.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-common-mistakes-include\">Common mistakes include:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Spelling errors&nbsp;<\/li>\n\n\n\n<li>Missing characters&nbsp;<\/li>\n\n\n\n<li>Incorrect domain names&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-example\">Example:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-john-company-co-instead-of-john-company-com\" class=\"wp-block-code\"><code><a href=\"mailto:john@company.co\" target=\"_blank\" rel=\"noreferrer noopener\">john@company.co<\/a>&nbsp;instead of&nbsp;<a href=\"mailto:john@company.com\" target=\"_blank\" rel=\"noreferrer noopener\">john@company.com<\/a>&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-correcting-the-address-often-resolves-the-issue-immediately\">Correcting the address often resolves the issue&nbsp;immediately.<\/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 the Mailbox Exists&nbsp;<\/strong><\/summary>\n<p id=\"htoc-if-the-email-is-sent-to-your-own-domain\">If the email is sent to your own domain:&nbsp;<\/p>\n\n\n\n<p id=\"htoc-log-in-to\">Log in to:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-log-in-to-cpanel-via-your-1-grid-customer-zone\/\"><strong>cPanel<\/strong><\/a> \u2192 Email Accounts&nbsp;<\/li>\n\n\n\n<li><a href=\"https:\/\/1grid.co.za\/knowledge\/plesk-how-do-i-login-via-customer-zone\/\"><strong>Plesk<\/strong><\/a> \u2192 Mail\n<ul class=\"wp-block-list\">\n<li>Check whether the mailbox exists.&nbsp;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-if-the-mailbox-does-not-exist\">If the mailbox does not exist:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Create the email account\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-create-or-delete-an-email-account-via-cpanel\/\"><strong>cPanel<\/strong><\/a><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-create-or-delete-an-email-account-via-plesk\/\">Plesk<\/a>&nbsp;<\/strong><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Or&nbsp;correct&nbsp;the intended address&nbsp;<\/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>4: Check Email Routing Configuration&nbsp;<\/strong><\/summary>\n<p id=\"htoc-incorrect-email-routing-can-cause-servers-to-reject-valid-users\">Incorrect email routing can cause servers to reject valid users.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-log-in-to1\">Log in to:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-log-in-to-cpanel-via-your-1-grid-customer-zone\/\"><strong>cPanel<\/strong><\/a> \u2192 <a href=\"https:\/\/1grid.co.za\/knowledge\/cpanel-how-to-change-mx-records-and-email-routing\/\"><strong>Email Routing&nbsp;<\/strong><\/a><\/li>\n\n\n\n<li>Plesk<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-confirm-the-setting-is-correct\">Confirm the setting is correct:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Local Mail Exchanger \u2192 if email is hosted locally&nbsp;<\/li>\n\n\n\n<li>Remote Mail Exchanger \u2192 if using Google Workspace or Microsoft 365&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-incorrect-routing-often-occurs-after-domain-migrations-or-hosting-changes\">Incorrect routing often occurs after&nbsp;<strong>domain migrations or hosting changes.<\/strong>&nbsp;<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>5: Review MX Records&nbsp;<\/strong><\/summary>\n<p id=\"htoc-incorrect-mx-records-can-direct-email-to-the-wrong-server\">Incorrect MX records can direct email to the wrong server.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-check-the-dns-records-by-using-a-dns-lookup-tool-to-verify\">Check the <a href=\"https:\/\/1grid.co.za\/knowledge\/understanding-dns-records-and-how-to-check-these\/\"><strong>DNS records<\/strong><\/a> by using a <strong><a href=\"https:\/\/1grid.co.za\/knowledge\/understanding-dns-records-and-how-to-check-these\/#htoc-11111111111111111111111\">DNS lookup tool<\/a> <\/strong>to verify:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>MX records point to the correct mail server.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-if-incorrect\">If incorrect:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Update the MX records in your domain DNS settings.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-dns-changes-may-take-time-to-propagate\">DNS changes may take time to<strong> <a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-dns-propagation-and-why-does-it-take-so-long\/\">propagate<\/a><\/strong>.&nbsp;<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>6: Check Email Forwarders&nbsp;<\/strong><\/summary>\n<p id=\"htoc-misconfigured-forwarders-can-cause-mailbox-lookup-failures\">Misconfigured forwarders can cause mailbox lookup failures.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-check\">Check:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>cPanel \u2192 Email Accounts \u2192 <a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-create-an-email-forwarder-in-cpanel\/\"><strong>Forwarders<\/strong><\/a><\/li>\n\n\n\n<li>Plesk \u2192&nbsp;Mail \u2192 <a href=\"https:\/\/1grid.co.za\/knowledge\/plesk-adding-email-forwarders\/\"><strong>Forwarding<\/strong><\/a>\n<ul class=\"wp-block-list\">\n<li>Confirm&nbsp;forwarders&nbsp;point to valid addresses.&nbsp;<\/li>\n\n\n\n<li>Remove any invalid or outdated forwarders.&nbsp;<\/li>\n<\/ul>\n<\/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: Contact the Recipient&nbsp;<\/strong><\/summary>\n<p id=\"htoc-if-all-checks-are-correct-on-your-side-the-issue-may-be-on-the-recipient-s-server\">If all checks are correct on your side, the issue may be on the&nbsp;recipient\u2019s&nbsp;server.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-ask-the-recipient-to\">Ask the recipient to:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Verify their mailbox exists&nbsp;<\/li>\n\n\n\n<li>Confirm the correct email address&nbsp;<\/li>\n\n\n\n<li>Contact their hosting provider if necessary&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-then-resend-the-message\">Then, resend 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>8: Review Delivery Logs (Basic Level)&nbsp;&nbsp;&nbsp;<\/strong><\/summary>\n<p id=\"htoc-log-in-to11\">Log in to:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-log-in-to-cpanel-via-your-1-grid-customer-zone\/\">cPanel<\/a> <\/strong>\u2192 Email \u2192 <strong><a href=\"https:\/\/1grid.co.za\/knowledge\/cpanel-how-to-view-delivery-reports-via-track-delivery\/\">Track Delivery<\/a>&nbsp;<\/strong><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/plesk-how-do-i-login-via-customer-zone\/\">Plesk<\/a> <\/strong>\u2192 Websites &amp; Domains \u2192 Select your domain \u2192 Mail \u2192 Track Email Delivery&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-then\">Then:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Observe retry attempts and timestamps&nbsp;<\/li>\n<\/ul>\n<\/details>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-quick-fixes-for-common-smtp-550-variations\"><strong>Quick&nbsp;Fixes for Common SMTP 550&nbsp;Variations&nbsp;<\/strong><\/h2>\n\n\n\n<p>SMTP&nbsp;550&nbsp;errors are&nbsp;<strong><a href=\"https:\/\/1grid.co.za\/knowledge\/why-emails-bounce-back-error-messages-and-how-to-fix-them\/#htoc-hard-bounce-permanent-failure\">permanent rejections<\/a><\/strong>, meaning the message cannot be delivered until the issue is corrected.&nbsp;<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>1. 550 No Such User Here&nbsp;<\/strong><\/summary>\n<p id=\"htoc-example1\">Example:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-550-no-such-user-here-550-user-unknown-550-recipient-not-found\" class=\"wp-block-code\"><code>550 No such user here&nbsp;\n550 User unknown&nbsp;\n550 Recipient not found&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-what-it-means-the-recipient-email-address-does-not-exist-on-the-destination-server\"><strong>What It Means:<\/strong>&nbsp;<br>The recipient email address does not exist on the destination server.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-how-to-fix-it\"><strong>How to Fix It:<\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Verify the spelling of the email address&nbsp;<\/li>\n\n\n\n<li>Confirm the mailbox still exists&nbsp;<\/li>\n\n\n\n<li>Ask the recipient to confirm their correct email&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-this-error-only-affects-the-specific-email-message\">This error only affects the specific email message.&nbsp;<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>2. 550 Invalid Recipient&nbsp;<\/strong><\/summary>\n<p id=\"htoc-example11\">Example:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-550-invalid-recipient-550-address-rejected\" class=\"wp-block-code\"><code>550 Invalid recipient&nbsp;\n550 Address rejected&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-what-it-means-the-email-address-format-or-domain-may-be-incorrect\"><strong>What It Means:<\/strong>&nbsp;<br>The email address format or domain may be incorrect.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-how-to-fix-it1\"><strong>How to Fix It:<\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check spelling and formatting&nbsp;<\/li>\n\n\n\n<li>Ensure the domain is correct&nbsp;<\/li>\n\n\n\n<li>Remove outdated addresses from mailing lists&nbsp;<\/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. 550 Mailbox Unavailable&nbsp;<\/strong><\/summary>\n<p id=\"htoc-example111\">Example:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-550-requested-action-not-taken-mailbox-unavailable\" class=\"wp-block-code\"><code>550 Requested&nbsp;action&nbsp;not taken: mailbox unavailable&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-what-it-means-the-mailbox-may-have-been-removed-disabled-or-not-yet-created\"><strong>What It Means:<\/strong>&nbsp;<br>The mailbox may have been removed, disabled, or not yet created.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-how-to-fix-it11\"><strong>How to Fix It:<\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ask the recipient to verify the mailbox exists&nbsp;<\/li>\n\n\n\n<li>If this is your domain, create the mailbox in your hosting panel&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-creating-or-correcting-the-mailbox-usually-resolves-the-issue\">Creating or correcting the mailbox usually resolves the issue.&nbsp;<\/p>\n<\/details>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-advanced-optional-fixes-for-technical-users\"><strong>Advanced&nbsp;(Optional)&nbsp;Fixes&nbsp;(For Technical Users)<\/strong>&nbsp;<\/h2>\n\n\n\n<p>Administrators, or Technical Users, can diagnose mailbox lookup failures and server-level issues using server logs and command-line tools.&nbsp;<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>1. Check Mail Server Logs&nbsp;<\/strong><\/summary>\n<p id=\"htoc-inspect-smtp-transaction-logs-to-determine-why-the-mailbox-lookup-failed\">Inspect SMTP transaction logs to&nbsp;determine&nbsp;why the mailbox lookup failed.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-common-log-locations\">Common log locations:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-var-log-exim-mainlog-var-log-maillog\" class=\"wp-block-code\"><code>\/var\/log\/exim_mainlog&nbsp;<br>\/var\/log\/maillog&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-search-for-rejection-messages\">Search for rejection messages:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-grep-550-var-log-exim-mainlog\" class=\"wp-block-code\"><code>grep \"550\" \/var\/log\/exim_mainlog&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-look-for\">Look for:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>User lookup failures&nbsp;<\/li>\n\n\n\n<li>Routing errors&nbsp;<\/li>\n\n\n\n<li>Invalid mailbox entries&nbsp;<\/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. Verify Mailbox Configuration&nbsp;<\/strong><\/summary>\n<p id=\"htoc-confirm-that-the-mailbox-exists-in-the-mail-server-configuration\">Confirm that&nbsp;the mailbox exists in the mail server configuration.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-check-mailbox-directories\">Check mailbox directories:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-home-username-mail-domain-com\" class=\"wp-block-code\"><code>\/home\/username\/mail\/domain.com\/&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-if-the-mailbox-directory-is-missing-recreate-the-account-in-the-hosting-panel\">If the mailbox directory is missing, recreate the account in the hosting panel.&nbsp;<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>3. Inspect DNS MX Records via CLI&nbsp;<\/strong><\/summary>\n<p id=\"htoc-verify-mx-configuration-using\">Verify MX configuration using:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-dig-mx-domain-com\" class=\"wp-block-code\"><code>dig MX domain.com&nbsp;<\/code><\/pre>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>4. Check Forwarders and Aliases&nbsp;<\/strong><\/summary>\n<p id=\"htoc-verify-alias-configuration-files\">Verify alias configuration files:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-etc-aliases-etc-valiases-domain-com\" class=\"wp-block-code\"><code>\/etc\/aliases&nbsp;<br>\/etc\/valiases\/domain.com&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-invalid-or-broken-aliases-may-trigger-user-lookup-errors\">Invalid or broken aliases may trigger user lookup errors.&nbsp;<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>5.&nbsp;Validate&nbsp;Email Routing&nbsp;<\/strong><\/summary>\n<p>Check Exim routing configuration:&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>exim&nbsp;-bt&nbsp;<a href=\"mailto:user@domain.com\" target=\"_blank\" rel=\"noreferrer noopener\">user@domain.com<\/a>&nbsp;<\/code><\/pre>\n\n\n\n<p>This command shows how the mail server attempts to route the message.&nbsp;<\/p>\n\n\n\n<p>Misrouted domains can cause mailbox lookup failures.&nbsp;<\/p>\n<\/details>\n<\/details>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-before-you-move-on\"><strong>Before You Move On<\/strong><strong>&nbsp;<\/strong>&nbsp;<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><\/ul>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Checklist<\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li>Confirm the recipient address is correct\u00a0<\/li>\n\n\n\n<li>Ensure the mailbox exists\u00a0<\/li>\n\n\n\n<li>Verify email routing configuration\u00a0<\/li>\n\n\n\n<li>Confirm MX records point to the correct mail server\u00a0<\/li>\n<\/ul>\n<\/details>\n\n\n\n<ul class=\"wp-block-list\"><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-if-this-didn-t-work\"><strong>If This&nbsp;Didn\u2019t&nbsp;Work<\/strong>&nbsp;<\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Confirm These 4 Things <\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li>Send the message from another email account&nbsp;<\/li>\n\n\n\n<li>Verify MX records using a DNS lookup tool&nbsp;<\/li>\n\n\n\n<li>Check forwarders and aliases&nbsp;<\/li>\n\n\n\n<li>Confirm the recipient mailbox still exists&nbsp;<\/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>Issues Persisting?<\/strong><\/summary>\n<p id=\"htoc-if-the-issue-persists-contact-support-with\">Contact support with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Full bounce message&nbsp;<\/li>\n\n\n\n<li>Timestamp of the email&nbsp;<\/li>\n\n\n\n<li>Sender address&nbsp;<\/li>\n\n\n\n<li>Recipient address&nbsp;<\/li>\n<\/ul>\n<\/details>\n\n\n\n<ul class=\"wp-block-list\"><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-common-mistakes-to-avoid\"><strong>Common Mistakes to Avoid<\/strong>&nbsp;<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-sending-to-outdated-mailing-list-addresses\">Sending to outdated mailing list addresses&nbsp;<\/li>\n\n\n\n<li id=\"htoc-using-incorrect-domain-names\">Using incorrect domain names&nbsp;<\/li>\n\n\n\n<li id=\"htoc-migrating-hosting-without-updating-mx-records\">Migrating hosting without updating MX records&nbsp;<\/li>\n\n\n\n<li id=\"htoc-incorrect-email-routing-after-domain-migration\">Incorrect email routing after domain migration&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-empowering-insight\"><strong>Empowering Insight<\/strong>&nbsp;<\/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>Most SMTP 550 errors are caused by simple address errors or deleted mailboxes. <\/p>\n\n\n\n<p>Verifying the recipient address usually resolves the problem within minutes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-next-recommended-steps\"><strong>Next Recommended Steps<\/strong>&nbsp;<\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Learn how to improve email deliverability&nbsp;<\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/a-guide-to-smtperror-codes\/\">Understanding SMTP Error Codes<\/a>&nbsp;<\/strong><\/li>\n\n\n\n<li>Configure <a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-enable-dkim-and-spf-on-your-mail-domain\/\"><strong>SPF<\/strong><\/a>, <a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-enable-dkim-and-spf-on-your-mail-domain\/\"><strong>DKIM<\/strong><\/a> and <strong><a href=\"https:\/\/1grid.co.za\/knowledge\/cpanel-how-to-add-dmarc-record\/\">DMARC<\/a>&nbsp;<\/strong><\/li>\n\n\n\n<li><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/email-delivery-failed-retry-timeout-exceeded-how-to-fix-it\/\">Troubleshooting Email Delivery Failures<\/a>&nbsp;<\/strong><\/li>\n<\/ul>\n<\/details>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-faqs\"><strong>FAQs<\/strong>&nbsp;<\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q.&nbsp;Will&nbsp;this&nbsp;affect my website?&nbsp;<\/strong><\/summary>\n<p id=\"htoc-no-this-error-only-affects-the-specific-email-message-being-sent\">No, this error only affects the specific email message being sent.&nbsp;<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q.&nbsp;Can&nbsp;I try resending the email?&nbsp;<\/strong><\/summary>\n<p id=\"htoc-you-can-resend-the-email-after-correcting-the-recipient-s-address-or-mailbox-issue\">You can resend the email after correcting the&nbsp;recipient&#8217;s&nbsp;address or mailbox issue.&nbsp;<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q.&nbsp;Does this&nbsp;error&nbsp;mean&nbsp;that&nbsp;my domain is blacklisted?&nbsp;<\/strong><\/summary>\n<p id=\"htoc-no-this-error-indicates-a-mailbox-lookup-failure-not-a-blacklist-issue\">No, this error&nbsp;indicates&nbsp;a mailbox lookup failure, not a blacklist issue.&nbsp;<\/p>\n<\/details>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-additional-resources\"><strong>Additional&nbsp;Resources<\/strong>&nbsp;<\/h2>\n\n\n\n<p><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>&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-need-additional-support\"><strong>Need Additional Support?<\/strong>&nbsp;<\/h2>\n\n\n\n<p><strong>We&#8217;re&nbsp;Here to&nbsp;<\/strong><a href=\"https:\/\/1grid.co.za\/knowledge\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Help<\/strong><\/a><strong>:<\/strong>&nbsp;<\/p>\n\n\n\n<p>Understanding SMTP Error&nbsp;550&nbsp;and how to fix this&nbsp;doesn\u2019t&nbsp;have&nbsp;to&nbsp;feel technical&nbsp;with&nbsp;this&nbsp;easy-to-reference guide. Stuck?&nbsp;Check out our&nbsp;<a href=\"https:\/\/1grid.co.za\/knowledge\/1-grid-scope-of-support\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Scope of Support<\/strong><\/a>, and then contact our Support Team for&nbsp;further&nbsp;clarity and&nbsp;guidance&nbsp;(<a href=\"https:\/\/1grid.co.za\/contact-us\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>https:\/\/1grid.co.za\/contact-us\/<\/strong><\/a>).&nbsp;We&#8217;re&nbsp;ready&nbsp;to see&nbsp;how we can help!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>SMTP Error&nbsp;550: No Such User Here&nbsp;means the recipient\u2019s mail server could not find the email address you are trying to send to.&nbsp; This guide will help you understand why the error occurs, identify&nbsp;the exact cause, fix the issue quickly, and restore successful email delivery.&nbsp; In most cases, the problem is&#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":[1731,1733,1730,1734,1729,1732,1494,1707,1514,1713,1706,1701],"class_list":["post-34551","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-email-troubleshooting","ht_kb_tag-550-invalid-recipient","ht_kb_tag-550-mailbox-unavailable","ht_kb_tag-550-no-such-user-here","ht_kb_tag-550-recipient-not-found","ht_kb_tag-550-smtp-error-code","ht_kb_tag-550-user-unknown","ht_kb_tag-email-configuration","ht_kb_tag-email-delivery-issues","ht_kb_tag-email-troubleshooting","ht_kb_tag-smtp-550-fix","ht_kb_tag-smtp-bounce-errors","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 550: No Such User Here (How to Fix) - 1-grid Knowledge Base<\/title>\n<meta name=\"description\" content=\"Fix SMTP Error 550 No Such User Here. 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