{"id":34535,"date":"2026-03-16T10:12:55","date_gmt":"2026-03-16T10:12:55","guid":{"rendered":"https:\/\/1grid.co.za\/knowledge\/?post_type=ht_kb&#038;p=34535"},"modified":"2026-03-16T13:11:04","modified_gmt":"2026-03-16T13:11:04","slug":"smtp-error-451-temporary-local-problem","status":"publish","type":"ht_kb","link":"https:\/\/1grid.co.za\/knowledge\/smtp-error-451-temporary-local-problem-how-to-fix\/","title":{"rendered":"SMTP Error 451: Temporary Local Problem (How to Fix)\u00a0"},"content":{"rendered":"\n<p>If&nbsp;you see&nbsp;<strong>SMTP Error 451: Temporary Local Problem<\/strong>, it means the receiving mail server&nbsp;<strong>temporarily rejected your message, but may accept it later<\/strong>.&nbsp;<\/p>\n\n\n\n<p>This guide will help you:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-understand-why-the-451-error-occurs\">Understand why the 451 error occurs\u00a0<\/li>\n\n\n\n<li id=\"htoc-determine-whether-the-issue-is-temporary\">Determine\u00a0whether the issue is temporary\u00a0<\/li>\n\n\n\n<li id=\"htoc-restore-successful-email-delivery\">Restore successful email delivery\u00a0<\/li>\n<\/ul>\n\n\n\n<p>In most cases,&nbsp;<strong>SMTP 451 errors resolve automatically<\/strong>&nbsp;once the receiving server becomes available again.&nbsp;<\/p>\n\n\n\n<p>Importantly, this error&nbsp;<strong>does not affect your website, hosting account, or stored mailboxes<\/strong>.&nbsp;<\/p>\n\n\n\n<p>By the end of this guide,&nbsp;you\u2019ll&nbsp;confidently&nbsp;identify&nbsp;SMTP 451 errors and&nbsp;how to address them.&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-7.png\" alt=\"SMTP Error 451: Temporary Local Problem (How to Fix) \" class=\"wp-image-34536\"\/><\/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\">Table of Contents<\/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-451-means\">What SMTP Error 451 Means&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-why-this-matters\">Why This Matters&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-step-by-step-fix-for-smtp-451-error-temporary-local-problem\">Step-by-Step Fix&nbsp;for SMTP 451&nbsp;Error \u2013&nbsp;Temporary&nbsp;Local Problem&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-quick-fixes-for-common-smtp-451-variations\">Quick Fixes for Common SMTP 451 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><li class=\"\"><a href=\"#htoc-before-you-move-on\">Before You Move&nbsp;On&nbsp;&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-if-this-didn-t-work\">If This&nbsp;Didn\u2019t&nbsp;Work&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-common-mistakes-to-avoid\">Common Mistakes to&nbsp;Avoid&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-empowering-insight\">Empowering Insight&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-next-recommended-steps\">Next Recommended Steps&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-faqs\">FAQs&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-additional-resources\">Additional&nbsp;Resources&nbsp;<\/a><\/li><\/ul><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-what-smtp-error-451-means\"><strong>What SMTP Error 451 Means<\/strong>&nbsp;<\/h2>\n\n\n\n<p>SMTP 451&nbsp;indicates&nbsp;a&nbsp;<strong>temporary problem&nbsp;on&nbsp;the receiving mail server<\/strong>.&nbsp;<\/p>\n\n\n\n<p>It belongs to the&nbsp;<strong><a href=\"https:\/\/1grid.co.za\/knowledge\/a-guide-to-smtperror-codes\/#htoc-smtp-error-codes\" target=\"_blank\" rel=\"noreferrer noopener\">4xx class of SMTP codes<\/a><\/strong>, which means the message&nbsp;<strong>may succeed if retried later<\/strong>.&nbsp;<\/p>\n\n\n\n<p>SMTP codes follow a three-digit format:&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Code Section<\/strong>&nbsp;<\/td><td><strong>Meaning<\/strong>&nbsp;<\/td><\/tr><tr><td>4&nbsp;<\/td><td>Temporary failure&nbsp;<\/td><\/tr><tr><td>5&nbsp;<\/td><td>Mail system status&nbsp;<\/td><\/tr><tr><td>1&nbsp;<\/td><td>Specific response condition&nbsp;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>In simple terms:&nbsp;<\/p>\n\n\n\n<p><strong>The server cannot process the message right now, but it may accept it later.<\/strong>&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-why-this-matters\"><strong>Why This Matters<\/strong>&nbsp;<\/h2>\n\n\n\n<p>Ignoring repeated 451 errors may lead to:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-delays-in-important-message-delivery\">delays in important message delivery&nbsp;<\/li>\n\n\n\n<li id=\"htoc-confusion-about-whether-emails-were-sent\">confusion about whether emails were sent&nbsp;<\/li>\n\n\n\n<li id=\"htoc-repeated-resend-attempts\">repeated resend attempts&nbsp;<\/li>\n\n\n\n<li id=\"htoc-unnecessary-support-requests\">unnecessary support requests&nbsp;<\/li>\n<\/ul>\n\n\n\n<p>Understanding the cause allows you to&nbsp;<strong>restore delivery quickly and safely<\/strong>.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-step-by-step-fix-for-smtp-451-error-temporary-local-problem\"><strong>Step-by-Step Fix&nbsp;for SMTP 451&nbsp;Error \u2013&nbsp;Temporary&nbsp;Local Problem<\/strong>&nbsp;<\/h2>\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 id=\"htoc-1-confirm-the-full-error-message\">&nbsp;Open the bounce notification and confirm it includes variations such as:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-451-temporary-local-problem-451-try-again-later-451-greylisted-451-server-busy-451-internal-resource-unavailable\" class=\"wp-block-code\"><code>451 Temporary local problem&nbsp;\n451 Try again later&nbsp;\n451&nbsp;Greylisted&nbsp;\n451 Server busy&nbsp;\n451 Internal resource unavailable<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-1\">If a different SMTP code appears, refer to&nbsp;the <a href=\"https:\/\/1grid.co.za\/knowledge\/a-guide-to-smtperror-codes\/\" target=\"_blank\" rel=\"noreferrer noopener\"><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: Retry the Email Later&nbsp;<\/strong><\/summary>\n<p id=\"htoc-2-retry-the-email-later\">Because 451 errors are temporary:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-wait-15-to-30-minutes\">wait&nbsp;<strong>15 to 30 minutes<\/strong>&nbsp;<\/li>\n\n\n\n<li id=\"htoc-resend-the-email\">resend the email&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-2-retry-the-email-later1\">Most mail servers retry delivery&nbsp;<strong>automatically<\/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: Reduce Large Email Attachments&nbsp;<\/strong><\/summary>\n<p id=\"htoc-3-reduce-large-email-attachments\">Some servers temporarily reject messages due to&nbsp;<strong>size or processing load<\/strong>.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-try\">Try:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>sending a smaller message&nbsp;<\/li>\n\n\n\n<li>removing attachments&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: Verify Sender Authentication&nbsp;<\/strong><\/summary>\n<p id=\"htoc-4-verify-sender-authentication\">Confirm your domain authentication is configured:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-spf\"><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-enable-dkim-and-spf-on-your-mail-domain\/\" target=\"_blank\" rel=\"noreferrer noopener\">SPF<\/a>&nbsp;<\/strong><\/li>\n\n\n\n<li id=\"htoc-dkim\"><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-enable-dkim-and-spf-on-your-mail-domain\/\" target=\"_blank\" rel=\"noreferrer noopener\">DKIM<\/a>&nbsp;<\/strong><\/li>\n\n\n\n<li id=\"htoc-dmarc\"><a href=\"https:\/\/1grid.co.za\/knowledge\/cpanel-how-to-add-dmarc-record\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>DMARC&nbsp;<\/strong><\/a><\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-4-verify-sender-authentication1\">Missing authentication may cause temporary filtering.&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 Delivery Logs (Basic Level)&nbsp;<\/strong><\/summary>\n<p id=\"htoc-5-review-delivery-logs-basic-level\">Log in to:&nbsp;<\/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> <\/strong>\u2192 Email \u2192 <a href=\"https:\/\/1grid.co.za\/knowledge\/cpanel-how-to-view-delivery-reports-via-track-delivery\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Track Delivery<\/strong><\/a>&nbsp;<\/li>\n\n\n\n<li id=\"htoc-plesk-websites-amp-domains-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> <\/strong>\u2192 Websites &amp; Domains \u2192 Mail \u2192 Track Email Delivery&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-confirm\">Confirm:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>retry attempts are occurring&nbsp;<\/li>\n\n\n\n<li>messages are&nbsp;<strong>deferred<\/strong>&nbsp;<\/li>\n<\/ul>\n<\/details>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-quick-fixes-for-common-smtp-451-variations\"><strong>Quick Fixes for Common SMTP 451 Variations<\/strong>&nbsp;<\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>1.&nbsp;451&nbsp;Greylisted&nbsp;\/ Try Again Later&nbsp;<\/strong><\/summary>\n<p id=\"htoc-1-451-greylisted-try-again-later\">Example:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-451-4-7-1-greylisted-451-try-again-later-451-mail-temporarily-deferred\" class=\"wp-block-code\"><code>451 4.7.1 Greylisted&nbsp;\n451 Try again later&nbsp;\n451 Mail temporarily deferred&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-what-it-means-the-receiving-server-uses-greylisting-to-reduce-spam-by-temporarily-delaying-messages-from-unknown-senders\"><strong>What It Means:<\/strong>&nbsp;<br>The receiving server&nbsp;uses&nbsp;<strong>greylisting<\/strong>&nbsp;to reduce spam by temporarily delaying messages from unknown senders.&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 id=\"htoc-wait-15-to-30-minutes1\">Wait&nbsp;<strong>15 to 30 minutes<\/strong>&nbsp;<\/li>\n\n\n\n<li id=\"htoc-allow-your-mail-server-to-retry-automatically\">Allow your mail server to&nbsp;<strong>retry automatically<\/strong>&nbsp;<\/li>\n\n\n\n<li id=\"htoc-avoid-resending-repeatedly\">Avoid resending repeatedly&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-1-451-greylisted-try-again-later1\">This delay is temporary and&nbsp;<strong>does not mean the message failed permanently<\/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>2. 451 Server Busy&nbsp;<\/strong><\/summary>\n<p id=\"htoc-2-451-server-busy\">Example:<\/p>\n\n\n\n<pre id=\"htoc-451-server-busy-451-temporary-local-problem\" class=\"wp-block-code\"><code>451 Server busy&nbsp;\n451 Temporary local problem&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-what-it-means-the-receiving-server-may-be-overloaded-or-undergoing-maintenance\"><strong>What It Means:<\/strong>&nbsp;<br>The receiving server may be&nbsp;<strong>overloaded or undergoing maintenance<\/strong>.&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>Retry sending the message later&nbsp;<\/li>\n\n\n\n<li>Wait a few minutes&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. 451 IP Reputation&nbsp;Greylisting&nbsp;<\/strong><\/summary>\n<p id=\"htoc-3-451-ip-reputation-greylisting\">Example:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-451-4-7-1-ip-reputation-greylisted\" class=\"wp-block-code\"><code>451 4.7.1 IP reputation&nbsp;greylisted&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-what-it-means-the-receiving-server-temporarily-flagged-the-sending-ip\"><strong>What It Means:<\/strong>&nbsp;<br>The receiving server temporarily flagged the sending IP.&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>ensure SPF\/DKIM authentication is configured&nbsp;<\/li>\n\n\n\n<li>retry later&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. 451 Resource Temporarily Unavailable&nbsp;<\/strong><\/summary>\n<p id=\"htoc-4-451-resource-temporarily-unavailable\">Example:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-451-internal-resource-temporarily-unavailable\" class=\"wp-block-code\"><code>451 Internal resource temporarily unavailable&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-what-it-means-the-receiving-mail-server-temporarily-lacks-resources\"><strong>What It Means:<\/strong>&nbsp;<br>The receiving mail server temporarily lacks resources.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-how-to-fix-it111\"><strong>How to Fix It:<\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Retry later once the server recovers.&nbsp;<\/li>\n<\/ul>\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,&nbsp;can&nbsp;diagnose temporary mail server conditions that trigger SMTP 451 responses. These checks help&nbsp;identify&nbsp;greylisting&nbsp;behaviour, resource limitations, or server configuration issues.&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-1-check-mail-server-logs\">Review SMTP transaction logs to&nbsp;determine&nbsp;why the receiving server temporarily rejected the message.&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-smtp-451-responses\">Search for SMTP 451 responses:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-grep-451-var-log-exim-mainlog\" class=\"wp-block-code\"><code>grep \"451\" \/var\/log\/exim_mainlog&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-look-for-indicators-such-as\">Look for indicators such as:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-greylisting-responses\">Greylisting&nbsp;responses&nbsp;<\/li>\n\n\n\n<li id=\"htoc-temporary-resource-limits\">Temporary resource limits&nbsp;<\/li>\n\n\n\n<li id=\"htoc-policy-based-temporary-rejections\">Policy-based temporary rejections&nbsp;<\/li>\n\n\n\n<li>Connection timeouts&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. Check Mail Queue Status&nbsp;<\/strong><\/summary>\n<p id=\"htoc-2-check-mail-queue-status\">A large outbound mail queue can trigger temporary delivery failures.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-check-the-current-queue\">Check the current queue:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-mailq\" class=\"wp-block-code\"><code>mailq&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-or\">or&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-exim-bp\" class=\"wp-block-code\"><code>exim&nbsp;-bp&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 id=\"htoc-large-message-backlogs\">large message backlogs&nbsp;<\/li>\n\n\n\n<li id=\"htoc-messages-repeatedly-deferred\">messages repeatedly deferred&nbsp;<\/li>\n\n\n\n<li id=\"htoc-retry-attempts-to-the-same-domain\">retry attempts to the same domain&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-2-check-mail-queue-status1\">If many messages are queued, the server may be&nbsp;<strong>rate-limited or temporarily blocked by the recipient server<\/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>3. Verify Sender Authentication Records&nbsp;<\/strong><\/summary>\n<p id=\"htoc-3-verify-sender-authentication-records\">Ensure the domain has valid email authentication configured.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-check-dns-records-for\">Check DNS records for:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-spf1\">SPF&nbsp;<\/li>\n\n\n\n<li id=\"htoc-dkim1\">DKIM&nbsp;<\/li>\n\n\n\n<li id=\"htoc-dmarc1\">DMARC&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-example-spf-lookup\">Example SPF lookup:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-dig-txt-domain-com\" class=\"wp-block-code\"><code>dig TXT domain.com&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-3-verify-sender-authentication-records1\">Improper authentication can cause&nbsp;<strong>temporary policy rejections or&nbsp;greylisting<\/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>4. Test SMTP Routing&nbsp;<\/strong><\/summary>\n<p id=\"htoc-4-test-smtp-routing\">Confirm that&nbsp;the mail server is routing the message correctly.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-use\">Use:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-exim-bt-user-domain-com\" 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 id=\"htoc-this-command-shows-the-mail-routing-path-used-by-the-server\">This command shows the&nbsp;<strong>mail routing path<\/strong>&nbsp;used by the server.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-look-for1\">Look for:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>incorrect mail server destinations&nbsp;<\/li>\n\n\n\n<li>routing errors&nbsp;<\/li>\n\n\n\n<li>misconfigured domains&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>5. Check Server Resource Availability&nbsp;<\/strong><\/summary>\n<p id=\"htoc-5-check-server-resource-availability\">Temporary local problems may occur if the mail server is under heavy load.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-verify\">Verify:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-cpu-usage\">CPU usage&nbsp;<\/li>\n\n\n\n<li id=\"htoc-memory-availability\">memory availability&nbsp;<\/li>\n\n\n\n<li id=\"htoc-disk-space\">disk space&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-example-checks\">Example checks:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-top-df-h-free-m\" class=\"wp-block-code\"><code>top&nbsp;<br>df -h&nbsp;<br>free -m&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-5-check-server-resource-availability1\">If resources are constrained, the server may temporarily reject new messages until capacity is available.&nbsp;<\/p>\n<\/details>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-before-you-move-on\"><strong>Before You Move&nbsp;On<\/strong><strong>&nbsp;<\/strong>&nbsp;<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-wait-at-least-30-minutes-before-retrying\">Wait at least&nbsp;<strong>30 minutes before retrying<\/strong>&nbsp;<\/li>\n\n\n\n<li id=\"htoc-confirm-recipient-address-is-correct\">Confirm the recipient address is correct&nbsp;<\/li>\n\n\n\n<li id=\"htoc-avoid-sending-large-attachments\">Avoid sending large attachments&nbsp;<\/li>\n\n\n\n<li id=\"htoc-ensure-spf-dkim-authentication-is-configured1\">Ensure <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<\/a> <\/strong>authentication is configured&nbsp;<\/li>\n<\/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<p>Try these&nbsp;additional&nbsp;checks:&nbsp;&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-retry-with-a-simple-plain-text-email\">Retry with a simple plain-text email&nbsp;<\/li>\n\n\n\n<li id=\"htoc-remove-attachments\">Remove attachments&nbsp;<\/li>\n\n\n\n<li id=\"htoc-verify-spf-dkim-alignment\">Verify <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<\/a> <\/strong>alignment&nbsp;<\/li>\n\n\n\n<li id=\"htoc-check-sending-limits\">Check sending limits&nbsp;<\/li>\n<\/ul>\n\n\n\n<p>If the issue continues, contact support and include:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-error-message\">Error message&nbsp;<\/li>\n\n\n\n<li id=\"htoc-timestamp\">Timestamp&nbsp;<\/li>\n\n\n\n<li id=\"htoc-sender-address\">Sender address&nbsp;<\/li>\n\n\n\n<li id=\"htoc-recipient-address\">Recipient address&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-common-mistakes-to-avoid\"><strong>Common Mistakes to&nbsp;Avoid<\/strong>&nbsp;<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-sending-the-same-message-repeatedly-within-minutes\">Sending the same message repeatedly within minutes&nbsp;<\/li>\n\n\n\n<li id=\"htoc-assuming-the-message-permanently-failed\">Assuming the message permanently failed&nbsp;<\/li>\n\n\n\n<li id=\"htoc-ignoring-retry-attempts-from-your-mail-server\">Ignoring retry attempts from your mail server&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><a href=\"https:\/\/1grid.co.za\/knowledge\/why-emails-bounce-back-error-messages-and-how-to-fix-them\/#htoc-soft-bounce-temporary-failure\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Temporary<\/strong><\/a> SMTP errors often resolve&nbsp;<strong>automatically without intervention<\/strong>.&nbsp;<br>&nbsp;<br>Allowing your mail server to retry usually restores delivery safely.&nbsp;<\/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<p>Learn how to improve email deliverability:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-understanding-smtp-error-codes\"><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/a-guide-to-smtperror-codes\/\" target=\"_blank\" rel=\"noreferrer noopener\">Understanding SMTP Error Codes<\/a>&nbsp;<\/strong><\/li>\n\n\n\n<li id=\"htoc-troubleshooting-email-delivery-failures\"><a href=\"https:\/\/1grid.co.za\/knowledge\/unable-to-send-emails-receiving-is-fine-how-to-fix\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Troubleshooting Email Sending Issues&nbsp;<\/strong><\/a><\/li>\n\n\n\n<li id=\"htoc-\"><a href=\"https:\/\/1grid.co.za\/knowledge\/why-emails-bounce-back-error-messages-and-how-to-fix-them\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Why Emails Bounce Back, Error Messages and How to Fix Them<\/strong><\/a><\/li>\n<\/ul>\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 this affect my website?&nbsp;&nbsp;<\/strong><\/summary>\n<p id=\"htoc-q-will-this-affect-my-website-no-smtp-errors-only-affect-email-delivery-not-website-hosting\">No, SMTP errors only affect email delivery, not website hosting.&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;Is my domain blacklisted?<\/strong><\/summary>\n<p id=\"htoc-q-is-my-domain-blacklisted-not-usually-as-smtp-451-errors-are-temporary-conditions\">Not&nbsp;usually,&nbsp;as SMTP 451 errors are temporary conditions.&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><a href=\"https:\/\/1grid.co.za\/knowledge\/smtp-error-550-message-rejected-by-server-how-to-fix-it\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>SMTP Authentication Failed (550)&nbsp;<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/recommended-server-settings-for-email-encryption-ports\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Recommended Server Settings for Email (Encryption &amp; Ports)<\/strong><\/a><br><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/settings-to-configure-your-1grid-email-accounts-across-devices\/\" target=\"_blank\" rel=\"noreferrer noopener\">How to Configure Email Clients<\/a>&nbsp;<\/strong><br><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-access-your-email-via-webmail\/\" target=\"_blank\" rel=\"noreferrer noopener\">Accessing Your Email via Webmail<\/a>&nbsp;<\/strong><\/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;451&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!&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>If&nbsp;you see&nbsp;SMTP Error 451: Temporary Local Problem, it means the receiving mail server&nbsp;temporarily rejected your message, but may accept it later.&nbsp; This guide will help you:&nbsp; In most cases,&nbsp;SMTP 451 errors resolve automatically&nbsp;once the receiving server becomes available again.&nbsp; Importantly, this error&nbsp;does not affect your website, hosting account, or stored&#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":[1705,1702,1703,1494,1707,1514,1704,1706,1701],"class_list":["post-34535","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-email-troubleshooting","ht_kb_tag-451-greylisted-email","ht_kb_tag-451-temporary-local-problem","ht_kb_tag-451-try-again-later","ht_kb_tag-email-configuration","ht_kb_tag-email-delivery-issues","ht_kb_tag-email-troubleshooting","ht_kb_tag-smtp-451-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 451: Temporary Local Problem (How to Fix)\u00a0 - 1-grid Knowledge Base<\/title>\n<meta name=\"description\" content=\"Fix SMTP Error 451 Temporary Local Problem. 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