{"id":34694,"date":"2026-06-09T11:17:00","date_gmt":"2026-06-09T11:17:00","guid":{"rendered":"https:\/\/1grid.co.za\/knowledge\/?post_type=ht_kb&#038;p=34694"},"modified":"2026-06-09T11:18:09","modified_gmt":"2026-06-09T11:18:09","slug":"smtp-error-450-mailbox-temporarily-unavailable-how-to-fix","status":"publish","type":"ht_kb","link":"https:\/\/1grid.co.za\/knowledge\/smtp-error-450-mailbox-temporarily-unavailable-how-to-fix\/","title":{"rendered":"SMTP Error 450: Mailbox Temporarily Unavailable (How to Fix)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">If you\u2019ve received <strong>SMTP Error 450: Mailbox Temporarily Unavailable<\/strong>, it means the receiving mail server temporarily rejected your email.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide will:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-explain-what-smtp-450-actually-means\">Explain what SMTP 450 actually means<\/li>\n\n\n\n<li id=\"htoc-help-you-identify-the-specific-cause-temporary-mailbox-greylisting-or-server-load\">Help you identify the specific cause (temporary mailbox, greylisting, or server load)<\/li>\n\n\n\n<li id=\"htoc-show-you-how-to-fix-or-monitor-the-issue-safely\">Show you how to fix or monitor the issue safely<\/li>\n\n\n\n<li id=\"htoc-clarify-whether-the-problem-is-on-your-side-or-the-recipient-s\">Clarify whether the problem is on your side or the recipient\u2019s<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">By the end of this guide, you\u2019ll confidently diagnose and resolve SMTP 450 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-23.png\" alt=\"SMTP Error 450: Mailbox Temporarily Unavailable (How to Fix)\" class=\"wp-image-34695\"\/><\/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\">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-step-by-step-fix-for-smtp-450-error-temporary-reject-soft-bounce\">Step-by-Step Fix for SMTP 450 Error \u2013 Temporary Reject \/ Soft Bounce<\/a><\/li><li class=\"\"><a href=\"#htoc-quick-fixes-for-common-smtp-554-variations\">Quick Fixes for Common SMTP 554 Variations&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-advanced-optional-fixes-for-technical-users\">Advanced (Optional) Fixes (For Technical Users)<\/a><\/li><\/ul><\/div><\/div>\n\n\n\n<h2 id=\"htoc-what-smtp-error-450-means\" class=\"wp-block-heading\">What SMTP Error 450 Means<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SMTP 450 is a <strong>temporary rejection (soft bounce)<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike permanent errors (5xx), a 450 response means:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-the-receiving-server-temporarily-refused-the-message\">The receiving server temporarily refused the message<\/li>\n\n\n\n<li id=\"htoc-your-server-will-usually-retry-delivery-automatically\">Your server will usually retry delivery automatically<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Common reasons include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-greylisting-recipient-server-filtering-unknown-senders\">Greylisting (recipient server filtering unknown senders)<\/li>\n\n\n\n<li id=\"htoc-mailbox-storage-limits-on-the-recipient-side\">Mailbox storage limits on the recipient side<\/li>\n\n\n\n<li id=\"htoc-recipient-account-temporarily-locked-or-under-maintenance\">Recipient account temporarily locked or under maintenance<\/li>\n\n\n\n<li id=\"htoc-server-side-resource-limitations-or-high-load\">Server-side resource limitations or high load<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Because 450 is temporary, understanding the cause helps prevent unnecessary retries and avoids triggering more blocks.<\/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 450 errors may lead to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-delays-in-message-delivery\">Delays in message delivery<\/li>\n\n\n\n<li id=\"htoc-confusion-over-failed-emails\">Confusion over \u201cfailed\u201d emails<\/li>\n\n\n\n<li id=\"htoc-unnecessary-ticket-submissions-to-support\">Unnecessary ticket submissions to support<\/li>\n\n\n\n<li id=\"htoc-high-volume-sending-delays\">High-volume sending delays<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Correctly interpreting the bounce ensures safe, successful delivery without impacting your domain, IP reputation, or hosting environment.<\/p>\n\n\n\n<h2 id=\"htoc-step-by-step-fix-for-smtp-450-error-temporary-reject-soft-bounce\" class=\"wp-block-heading\"><strong>Step-by-Step Fix for SMTP 450 Error \u2013 Temporary Reject \/ Soft Bounce<\/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-450-mailbox-temporarily-unavailable\" class=\"wp-block-code\"><code>450 Mailbox temporarily unavailable<br>450 4.1.1 Recipient address rejected<br>450 4.2.0 Greylisted<br>450 4.3.2 Service currently unavailable<br>450 4.7.1 Try again later<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-if-a-different-smtp-code-appears-refer-to-the-correct-guide\">If a different SMTP code appears, refer to the correct 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: Wait Before Retrying<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-because-450-is-temporary\">Because 450 is temporary:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-retry-sending-after-30-to-60-minutes\">Retry sending after <strong>30 to 60 minutes<\/strong><\/li>\n\n\n\n<li id=\"htoc-avoid-repeated-resends-as-this-can-trigger-greylisting-or-throttling\">Avoid repeated resends as this can trigger greylisting or throttling<\/li>\n\n\n\n<li id=\"htoc-high-volume-sending-may-require-batch-scheduling\">High-volume sending may require batch scheduling<\/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: Verify Recipient Email Address<\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li id=\"htoc-check-for-typos-or-formatting-errors\">Check for typos or formatting errors<\/li>\n\n\n\n<li id=\"htoc-confirm-the-recipient-address-is-active\">Confirm the recipient address is active<\/li>\n\n\n\n<li id=\"htoc-ask-recipient-to-provide-an-alternative-address-if-necessary\">Ask the recipient to provide an alternative address if necessary<\/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: Remove Large Attachments<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-large-emails-can-trigger-temporary-deferrals\">Large emails can trigger temporary deferrals:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-compress-files-zip-7z\">Compress files (ZIP, 7z)<\/li>\n\n\n\n<li id=\"htoc-use-cloud-storage-links-for-large-content\">Use cloud storage links for large content<\/li>\n\n\n\n<li id=\"htoc-keep-email-size-under-20-to-25-mb\">Keep email size under 20 to 25 MB<\/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: Review Delivery Logs (Basic Level)&nbsp;<\/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\">cPanel \u2192 Email \u2192 Track Delivery<\/li>\n\n\n\n<li id=\"htoc-plesk-websites-amp-domains-select-your-domain-mail-track-email-delivery\">Plesk \u2192 Websites &amp; Domains \u2192 Select your domain \u2192 Mail \u2192 Track Email Delivery<\/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-messages-are-deferred-not-permanently-rejected\">Messages are <strong>deferred<\/strong>, not permanently rejected<\/li>\n\n\n\n<li id=\"htoc-observe-retry-attempts-and-timestamps\">Observe retry attempts and timestamps<\/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>6: Ask Recipient to Check Their Mailbox<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-temporary-rejection-may-be-recipient-side\">Temporary rejection may be recipient-side:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-mailbox-full\">Mailbox full<\/li>\n\n\n\n<li id=\"htoc-account-locked-or-under-maintenance\">Account locked or under maintenance<\/li>\n\n\n\n<li id=\"htoc-server-anti-spam-policies\">Server anti-spam policies<\/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: Monitor Delivery for 24 Hours<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-step-7-monitor-delivery-for-24-hours\">If the email is still not delivered after 24 hours, contact the recipient\u2019s provider<\/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 450 is a <strong>temporary rejection (\u201csoft bounce\u201d)<\/strong>. This means the receiving server temporarily refused the message, and it may be retried automatically.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike permanent errors (5xx), 450 usually resolves after waiting or minor adjustments.<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>1. 450 4.7.1 Greylisted \/ Try Again Later<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-1-450-4-7-1-greylisted-try-again-later\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre id=\"htoc-450-4-7-1-greylisted-for-5-minutes450-4-7-1-try-again-later450-mail-temporarily-deferred\" class=\"wp-block-code\"><code>450 4.7.1 Greylisted for 5 minutes<br>450 4.7.1 Try again later<br>450 Mail temporarily deferred<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-what-it-means-the-recipient-server-is-using-greylisting-or-a-temporary-delay-mechanism-to-filter-potential-spam-your-message-is-not-rejected-permanently-it-is-being-held-temporarily\"><strong>What It Means:<\/strong><br>The recipient server is using greylisting or a temporary delay mechanism to filter potential spam. Your message is not rejected permanently; it is being held temporarily.<\/p>\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-wait-15-to-30-minutes-and-allow-automatic-retries\">Wait 15 to 30 minutes and allow automatic retries<\/li>\n\n\n\n<li id=\"htoc-reduce-sending-frequency-or-batch-emails-if-sending-in-bulk\">Reduce sending frequency or batch emails if sending in bulk<\/li>\n\n\n\n<li id=\"htoc-ensure-your-sending-server-follows-proper-spf-dkim-authentication\">Ensure your sending server follows proper SPF\/DKIM authentication<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-1-450-4-7-1-greylisted-try-again-later1\">It only delays delivery temporarily.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>2. 450 4.1.1 Recipient Address Rejected<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-example\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre id=\"htoc-450-4-1-1-recipient-address-rejected450-4-1-1-recipient-domain-com-unverified-address\" class=\"wp-block-code\"><code>450 4.1.1 Recipient address rejected<br>450 4.1.1 <a href=\"mailto:recipient@domain.com\">recipient@domain.com<\/a>: Unverified address<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-what-it-means-the-recipient-s-email-address-may-be-incorrect-inactive-or-under-temporary-verification-by-the-server\"><strong>What It Means:<\/strong><br>The recipient&#8217;s email address may be incorrect, inactive, or under temporary verification by the server.<\/p>\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-spelling-and-formatting-of-the-recipient-email\">Verify spelling and formatting of the recipient email<\/li>\n\n\n\n<li id=\"htoc-confirm-the-address-with-the-recipient\">Confirm the address with the recipient<\/li>\n\n\n\n<li id=\"htoc-request-an-alternative-address-if-necessary\">Request an alternative address if necessary<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-no-permanent-impact-occurs-on-your-mailbox-or-hosting-as-the-message-is-only-deferred\">No permanent impact occurs on your mailbox or hosting as the message is only deferred.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>3. 450 Mailbox Unavailable<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-3-450-mailbox-unavailable\"><strong>Example: <\/strong><\/p>\n\n\n\n<pre id=\"htoc-450-mailbox-temporarily-unavailable450-sorry-mailbox-is-locked450-mailbox-is-busy-try-again-later\" class=\"wp-block-code\"><code>450 Mailbox temporarily unavailable<br>450 Sorry, mailbox is locked<br>450 Mailbox is busy, try again later<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-what-it-means-the-recipient-s-mailbox-is-temporarily-locked-full-or-undergoing-maintenance\"><strong>What It Means:<\/strong><br>The recipient\u2019s mailbox is temporarily locked, full, or undergoing maintenance.<\/p>\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-ask-the-recipient-to-check-their-mailbox-storage-or-unlock-the-account\">Ask the recipient to check their mailbox storage or unlock the account<\/li>\n\n\n\n<li id=\"htoc-retry-sending-after-the-mailbox-is-available\">Retry sending after the mailbox is available<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-this-error-affects-email-delivery-only-not-your-hosting-or-domain-configuration\">This error affects <strong>email delivery only<\/strong>, not your hosting or domain configuration.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>4. 450 4.3.2 Service Currently Unavailable<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-example1\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre id=\"htoc-450-4-3-2-service-currently-unavailable450-4-3-2-try-again-later\" class=\"wp-block-code\"><code>450 4.3.2 Service currently unavailable<br>450 4.3.2 Try again later<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-what-it-means-the-recipient-server-is-temporarily-overloaded-or-experiencing-issues\"><strong>What It Means:<\/strong><br>The recipient server is temporarily overloaded or experiencing issues.<\/p>\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-wait-and-retry-later\">Wait and retry later<\/li>\n\n\n\n<li id=\"htoc-reduce-simultaneous-connections-if-sending-multiple-emails\">Reduce simultaneous connections if sending multiple emails<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-this-is-a-temporary-condition-on-the-recipient-server\">This is a temporary condition on the recipient server.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>5. 450 Account Limit Exceeded<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-example11\"><strong>Example:<\/strong><\/p>\n\n\n\n<pre id=\"htoc-450-account-limit-exceeded450-mailbox-quota-reached\" class=\"wp-block-code\"><code>450 Account limit exceeded<br>450 Mailbox quota reached<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-what-it-means-the-recipient-mailbox-has-exceeded-its-storage-quota\"><strong>What It Means:<\/strong><br>The recipient mailbox has exceeded its storage quota.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-how-to-fix-it1111\"><strong>How to Fix It:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-recipient-must-free-space-in-their-mailbox\">Recipient must free space in their mailbox<\/li>\n\n\n\n<li id=\"htoc-retry-sending-once-sufficient-storage-is-available\">Retry sending once sufficient storage is available<\/li>\n<\/ul>\n<\/details>\n\n\n\n<h2 id=\"htoc-advanced-optional-fixes-for-technical-users\" class=\"wp-block-heading\">Advanced (Optional) Fixes (For Technical Users)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Administrators or Technical Users can diagnose server-level issues, retries, or permanent deferrals.<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>1. Diagnose Mail Queue<\/strong><\/summary>\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Exim<\/strong><\/summary>\n<pre id=\"htoc-exim\" class=\"wp-block-code\"><code>exim -bp\nexim -M &lt;message-id&gt;<\/code><\/pre>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Postfix<\/strong><\/summary>\n<pre id=\"htoc-postfix\" class=\"wp-block-code\"><code>postqueue -p\npostcat -q &lt;queue-id&gt;<\/code><\/pre>\n<\/details>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-check-for-stuck-messages-or-repeated-deferrals\">Check for stuck messages or repeated deferrals.<\/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 IP Reputation<\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li id=\"htoc-confirm-sending-ip-not-on-blocklists\">Confirm the sending IP is not on blocklists<\/li>\n\n\n\n<li id=\"htoc-review-spf-dkim-dmarc-alignment\">Review SPF, DKIM, DMARC alignment<\/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. Review SMTP Rate Limits<\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li id=\"htoc-high-volume-sending-can-trigger-extended-deferrals\">High-volume sending can trigger extended deferrals<\/li>\n\n\n\n<li id=\"htoc-reduce-concurrent-smtp-connections-or-batch-emails\">Reduce concurrent SMTP connections or batch emails<\/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 Reverse DNS (PTR Record)<\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li id=\"htoc-ensure-ptr-exists-and-matches-helo-hostname\">Ensure PTR exists and matches HELO hostname<\/li>\n\n\n\n<li id=\"htoc-misalignment-can-trigger-greylisting\">Misalignment can trigger greylisting<\/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. Monitor Mail Logs for Patterns<\/strong><\/summary>\n<pre id=\"htoc-exim-var-log-exim-mainlogpostfix-var-log-maillog\" class=\"wp-block-code\"><code><strong>Exim:<\/strong> \/var\/log\/exim_mainlog<br><strong>Postfix:<\/strong> \/var\/log\/maillog<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-look-for-repeated-450-entries-per-recipient\">Look for repeated 450 entries per recipient<\/li>\n\n\n\n<li id=\"htoc-identify-temporary-vs-permanent-failures\">Identify temporary vs permanent failures<\/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>6. Restart Mail Service (Optional)<\/strong><\/summary>\n<pre id=\"htoc-service-exim-restart-orservice-postfix-restart\" class=\"wp-block-code\"><code>service exim restart<br># or<br>service postfix restart<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"htoc-only-restart-if-mail-service-appears-stalled\">Only restart if mail service appears stalled.<\/p>\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-email-address-is-correct-and-active\">Confirm the recipient email address is correct and active<\/li>\n\n\n\n<li id=\"htoc-wait-15-to-30-minutes-to-allow-automatic-retries-greylisting-or-temporary-deferral\">Wait 15 to 30 minutes to allow automatic retries (greylisting or temporary deferral)<\/li>\n\n\n\n<li id=\"htoc-reduce-simultaneous-outgoing-connections-if-sending-multiple-emails\">Reduce simultaneous outgoing connections if sending multiple emails<\/li>\n\n\n\n<li id=\"htoc-ensure-email-size-is-within-recipient-limits\">Ensure email size is within recipient limits<\/li>\n\n\n\n<li id=\"htoc-if-using-attachments-consider-splitting-large-files-or-using-cloud-links\">If using attachments, consider splitting large files or using cloud links<\/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<ul class=\"wp-block-list\">\n<li id=\"htoc-retry-sending-a-simple-plain-text-email\">Retry sending a simple, plain-text email<\/li>\n\n\n\n<li id=\"htoc-remove-or-reduce-attachments\">Remove or reduce attachments<\/li>\n\n\n\n<li id=\"htoc-ask-the-recipient-to-check-mailbox-availability-and-storage\">Ask the recipient to check mailbox availability and storage<\/li>\n\n\n\n<li id=\"htoc-verify-that-spf-dkim-and-dmarc-are-correctly-configured-on-your-sending-domain\">Verify that SPF, DKIM, and DMARC are correctly configured on your sending domain<\/li>\n\n\n\n<li id=\"htoc-confirm-you-re-not-exceeding-your-sending-limits-or-batch-sizes\">Confirm you\u2019re not exceeding your sending limits or batch sizes<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If the issue persists, contact support with:<\/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-time-the-email-was-sent\">Time the email was sent<\/li>\n\n\n\n<li id=\"htoc-sender-and-recipient-addresses\">Sender and recipient addresses<\/li>\n\n\n\n<li id=\"htoc-any-steps-already-attempted\">Any steps already attempted<\/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-repeatedly-resending-same-email-immediately\">Repeatedly resending the same email immediately<\/li>\n\n\n\n<li id=\"htoc-assuming-blacklisting-is-the-cause\">Assuming blacklisting is the cause<\/li>\n\n\n\n<li id=\"htoc-modifying-dns-unnecessarily\">Modifying DNS unnecessarily<\/li>\n\n\n\n<li id=\"htoc-ignoring-queue-or-log-monitoring\">Ignoring queue or log monitoring<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Note:<\/strong> SMTP 450 only affects <strong>email delivery<\/strong>, not hosting, domain registration, or stored mailboxes.<\/p>\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\">Greylisting protects recipient servers from spam. Legitimate emails are <strong>automatically retried<\/strong>, so patience solves most SMTP 450 errors.<\/p>\n\n\n\n<h2 id=\"htoc-next-recommended-steps\" class=\"wp-block-heading\">Next Recommended Steps<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-check-full-bounce-details\">Check full bounce details<\/li>\n\n\n\n<li id=\"htoc-verify-recipient-address\">Verify recipient address<\/li>\n\n\n\n<li id=\"htoc-confirm-spf-dkim-records\">Confirm SPF\/DKIM records<\/li>\n\n\n\n<li id=\"htoc-monitor-deferred-messages\">Monitor deferred messages<\/li>\n\n\n\n<li id=\"htoc-review-email-content-and-size\">Review email content and size<\/li>\n<\/ul>\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. Is SMTP 450 permanent?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-q-is-smtp-450-permanent-no-it-s-a-temporary-error-soft-bounce-that-resolves-automatically-or-after-simple-fixes\">No, it\u2019s a temporary error (soft bounce) that resolves automatically or after simple fixes.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q. Will this affect my website or hosting?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-q-will-this-affect-my-website-or-hosting-no-it-only-impacts-the-delivery-of-the-email\">No, it only impacts the delivery of the email.<\/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 anything?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-q-can-i-undo-anything-no-configuration-changes-are-required-in-most-cases\">No configuration changes are required in most cases.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q. Is this my fault?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\" id=\"htoc-q-is-this-my-fault-usually-not-as-this-is-typically-recipient-side-or-greylisting-rules-that-often-trigger-450\">Usually not, as this is typically recipient-side or greylisting rules that often trigger 450.<\/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 450 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 you\u2019ve received SMTP Error 450: Mailbox Temporarily Unavailable, it means the receiving mail server temporarily rejected your email. This guide will: By the end of this guide, you\u2019ll confidently diagnose and resolve SMTP 450 errors without unnecessary support escalation. What SMTP Error 450 Means SMTP 450 is a temporary&#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":[1778,1779,1494,1707,1514,1781,1706,1776,1701],"class_list":["post-34694","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-email-troubleshooting","ht_kb_tag-450-mailbox-busy","ht_kb_tag-450-temporary-email-failure","ht_kb_tag-email-configuration","ht_kb_tag-email-delivery-issues","ht_kb_tag-email-troubleshooting","ht_kb_tag-smtp-450-fix","ht_kb_tag-smtp-bounce-errors","ht_kb_tag-smtp-error-450","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 450: Mailbox Temporarily Unavailable (How to Fix) - 1-grid Knowledge Base<\/title>\n<meta name=\"description\" content=\"Fix SMTP Error 450 temporary delivery failures. 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