{"id":34649,"date":"2026-05-13T13:03:47","date_gmt":"2026-05-13T13:03:47","guid":{"rendered":"https:\/\/1grid.co.za\/knowledge\/?post_type=ht_kb&#038;p=34649"},"modified":"2026-05-13T13:03:48","modified_gmt":"2026-05-13T13:03:48","slug":"smtp-error-552","status":"publish","type":"ht_kb","link":"https:\/\/1grid.co.za\/knowledge\/smtp-error-552-message-size-or-storage-limit-exceeded-how-to-fix-it\/","title":{"rendered":"SMTP Error 552: Message Size or Storage Limit Exceeded (How to Fix It)"},"content":{"rendered":"\n<p>If you\u2019ve received&nbsp;<strong>SMTP Error 552<\/strong>, it means your email could not be delivered because it either exceeds the recipient server\u2019s size&nbsp;limit&nbsp;or the recipient\u2019s mailbox storage is full.&nbsp;<\/p>\n\n\n\n<p>This guide will:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-explain-what-smtp-552-actually-means\">Explain what SMTP 552\u00a0actually means\u00a0<\/li>\n\n\n\n<li id=\"htoc-help-you-identify-the-specific-cause\">Help you\u00a0identify\u00a0the specific cause\u00a0<\/li>\n\n\n\n<li id=\"htoc-show-you-how-to-fix-the-issue-safely\">Show you how to fix the issue safely\u00a0<\/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\u00a0<\/li>\n<\/ul>\n\n\n\n<p>By the end of this guide,&nbsp;you\u2019ll&nbsp;confidently diagnose and resolve SMTP 552 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\/05\/1-grid-Images-for-KB-Articles-1000-x-600-px-16.png\" alt=\"SMTP Error 552: Message Size or Storage Limit Exceeded\" class=\"wp-image-34652\"\/><\/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-what-smtp-error-552-means\">What SMTP Error 552&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-552-error-message-size-storage-limit\">Step-by-Step Fix for&nbsp;SMTP 552 Error&nbsp;&#8211; Message Size \/ Storage Limit&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-quick-fixes-for-common-smtp-552-variations\">Quick&nbsp;Fixes for Common SMTP 552&nbsp;Variations&nbsp;&nbsp;&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-552-means\"><strong>What SMTP Error 552&nbsp;Means<\/strong>&nbsp;<\/h2>\n\n\n\n<p>SMTP 552 is often a&nbsp;<strong>permanent rejection (hard bounce)<\/strong>.&nbsp;<\/p>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>What This Error Usually Means<\/strong><\/summary>\n<p id=\"htoc-unlike-temporary-delivery-delays-a-552-response-usually-means\">Unlike temporary delivery delays, a 552 response usually means:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The recipient server rejected the message due to size limits or storage constraints&nbsp;<\/li>\n\n\n\n<li>The message will&nbsp;<strong>not retry automatically<\/strong>&nbsp;unless corrective action is taken&nbsp;<\/li>\n<\/ul>\n<\/details>\n\n\n\n<p>Extended error codes (e.g., 5.2.2, 5.3.4) provide the precise reason.&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>Understanding the root cause ensures you\u00a0<strong>fix the problem<\/strong>, not just resend the\u00a0email\u00a0and hope it works.\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 These Errors<\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li>Prevent important emails from being delivered&nbsp;<\/li>\n\n\n\n<li>Trigger repeated bounce-backs&nbsp;<\/li>\n\n\n\n<li>Reduce email deliverability over time&nbsp;<\/li>\n\n\n\n<li>Cause clients or customers to lose trust in your communication&nbsp;<\/li>\n<\/ul>\n<\/details>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-step-by-step-fix-for-smtp-552-error-message-size-storage-limit\"><strong>Step-by-Step Fix for<\/strong><strong>&nbsp;SMTP 552 Error&nbsp;&#8211; Message Size \/ Storage Limit<\/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<\/strong>\u00a0<\/summary>\n<p id=\"htoc-open-the-bounce-notification\">Open the&nbsp;bounce&nbsp;notification.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-ensure-it-references\">Ensure it references:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>552 5.2.2 Mailbox full&nbsp;<\/li>\n\n\n\n<li>552 5.3.4 Message size exceeds fixed maximum&nbsp;<\/li>\n\n\n\n<li>552 Message size limit exceeded&nbsp;<\/li>\n\n\n\n<li>552 Storage limit exceeded&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-if-a-different-smtp-code-appears-consult-the-relevant-guide\">If a different SMTP code appears, consult the relevant 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: Check the Total Email Size\u00a0<\/strong><\/summary>\n<p id=\"htoc-smtp-552-commonly-occurs-when-the-message-exceeds-size-limits\">SMTP 552 commonly occurs when the message exceeds size limits.&nbsp;<\/p>\n\n\n\n<p id=\"htoc-check\">Check:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Attachments&nbsp;<\/li>\n\n\n\n<li>Embedded images&nbsp;<\/li>\n\n\n\n<li>Email signatures with large graphics&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-keep-total-email-size-under\">Keep total email size under:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>20to&nbsp;25 MB (recommended safe range)&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: Reduce Attachment Size\u00a0<\/strong><\/summary>\n<p id=\"htoc-if-the-message-is-too-large\">If the message is too large:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Compress files (ZIP)&nbsp;<\/li>\n\n\n\n<li>Split attachments into multiple emails&nbsp;<\/li>\n\n\n\n<li>Use cloud storage links instead&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-then-resend\">Then resend.&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: Verify Recipient Mailbox Storage\u00a0<\/strong><\/summary>\n<p id=\"htoc-if-the-error-references-the-mailbox-quota\">If the error references the mailbox quota:\u00a0<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ask the recipient to free up space&nbsp;<\/li>\n\n\n\n<li>If you manage the mailbox, increase the quota in the Control Panel or upgrade\u00a0the\u00a0package\u00a0<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-once-storage-is-available-resend-the-message\">Once storage is available, resend the 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>5: Scan Attachments (If Security-Related)\u00a0<\/strong><\/summary>\n<p id=\"htoc-if-the-bounce-mentions\">If the bounce mentions:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Illegal attachment&nbsp;<\/li>\n\n\n\n<li>Virus detected&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>Scan your device for malware&nbsp;<\/li>\n\n\n\n<li>Recreate the file&nbsp;<\/li>\n\n\n\n<li>Remove suspicious 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>6: Review Delivery Logs (Basic Level)\u00a0<\/strong><\/summary>\n<p id=\"htoc-log-in-to\">Log in to:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>cPanel \u2192 Email \u2192 Track Delivery&nbsp;<\/li>\n\n\n\n<li>Plesk \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-confirm-whether-rejection-was-due-to\">Confirm whether rejection was due to:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Message size&nbsp;<\/li>\n\n\n\n<li>Mailbox quota&nbsp;<\/li>\n\n\n\n<li>Security policy&nbsp;<\/li>\n<\/ul>\n<\/details>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-quick-fixes-for-common-smtp-552-variations\"><strong>Quick&nbsp;Fixes for Common SMTP 552&nbsp;Variations&nbsp;&nbsp;<\/strong>&nbsp;<\/h2>\n\n\n\n<p>SMTP 552 occurs when:&nbsp;<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li id=\"htoc-message-exceeds-maximum-allowed-size\">Message exceeds maximum allowed size\u00a0<\/li>\n\n\n\n<li id=\"htoc-recipient-mailbox-is-full\">Recipient mailbox is full\u00a0<\/li>\n\n\n\n<li id=\"htoc-server-applies-other-limits-filters-or-policies\">Server applies other limits, filters, or policies\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\"><\/ol>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>1.\u00a0552 5.2.2 Mailbox Quota Exceeded\u00a0<\/strong><\/summary>\n<p id=\"htoc-example\">Example:\u00a0<\/p>\n\n\n\n<pre id=\"htoc-552-5-2-2-user-mailstore-exceeded-quota-552-5-2-2-mailbox-full\" class=\"wp-block-code\"><code>552 5.2.2 User\u00a0mailstore\u00a0exceeded quota\u00a0\n552 5.2.2 Mailbox full\u00a0<\/code><\/pre>\n\n\n\n<p id=\"htoc-what-it-means-recipient-mailbox-storage-is-full\"><strong>What It Means:<\/strong>&nbsp;<br>Recipient mailbox storage is full.&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>Ask the recipient to free up mailbox space&nbsp;<\/li>\n\n\n\n<li>If you manage the mailbox, increase the storage quota via the Control Panel<\/li>\n\n\n\n<li>Resend the email once space is available&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-reassurance-this-does-not-affect-your-hosting-or-email-account\"><strong>Reassurance:&nbsp;<\/strong>This does&nbsp;<strong>not affect your hosting or email account<\/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.\u00a0552 5.2.3 \/ 5.3.4 Message Size Exceeded\u00a0<\/strong><\/summary>\n<p id=\"htoc-example1\">Example:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-552-5-3-4-message-size-exceeds-fixed-maximum-552-message-size-limit-exceeded\" class=\"wp-block-code\"><code>552 5.3.4 Message size exceeds fixed maximum&nbsp;<br>552 Message size limit exceeded&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-what-it-means-your-email-plus-attachments-exceeds-the-server-s-allowed-message-size\"><strong>What It Means:<\/strong>&nbsp;<br>Your email plus attachments&nbsp;exceeds&nbsp;the server\u2019s allowed message size.&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>Compress attachments (ZIP\/7z)&nbsp;<\/li>\n\n\n\n<li>Use cloud storage links for large files&nbsp;<\/li>\n\n\n\n<li>Keep total email size under 20\u201325 MB&nbsp;<\/li>\n\n\n\n<li>Split attachments across multiple emails if needed&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.\u00a0552-5.7.0 Illegal \/ Virus Attachment Detected\u00a0<\/strong><\/summary>\n<p id=\"htoc-example11\">Example:\u00a0<\/p>\n\n\n\n<pre id=\"htoc-552-virus-found-inside-the-email-552-5-7-0-illegal-attachment\" class=\"wp-block-code\"><code>552 Virus found inside the email\u00a0\n552-5.7.0 Illegal attachment\u00a0<\/code><\/pre>\n\n\n\n<p id=\"htoc-what-this-means-the-server-flagged-an-attachment-as-unsafe\"><strong>What This Means:&nbsp;<\/strong>&nbsp;<br>The server flagged an attachment as unsafe.&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>Scan your device for malware&nbsp;<\/li>\n\n\n\n<li>Remove or recreate suspicious attachments&nbsp;<\/li>\n\n\n\n<li>Confirm the website and local devices are secure\u00a0<\/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 resolve&nbsp;server-level size or quota 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 Logs\u00a0<\/strong><\/summary>\n<p id=\"htoc-exim\"><strong>Exim:<\/strong>&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-grep-552-var-log-exim-mainlog-tail-f-var-log-exim-mainlog\" class=\"wp-block-code\"><code>grep \"552\" \/var\/log\/exim_mainlog&nbsp;<br>tail -f \/var\/log\/exim_mainlog&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-postfix\"><strong>Postfix:<\/strong>&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-grep-552-var-log-maillog-tail-f-var-log-maillog\" class=\"wp-block-code\"><code>grep \"552\" \/var\/log\/maillog&nbsp;<br>tail -f \/var\/log\/maillog&nbsp;<\/code><\/pre>\n\n\n\n<p id=\"htoc-goal-identify-whether-552-is-due-to-message-size-mailbox-quota-or-illegal-attachment\"><strong>Goal:<\/strong>&nbsp;Identify&nbsp;whether 552 is due to message size, mailbox quota, or illegal attachment&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. Review Mail Queue\u00a0<\/strong><\/summary>\n<pre id=\"htoc-exim-bp-exim-postqueue-p-postfix\" class=\"wp-block-code\"><code>exim&nbsp;-bp&nbsp;&nbsp;&nbsp; # Exim&nbsp;<br>postqueue -p&nbsp; #&nbsp;Postfix&nbsp;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Verify deferred vs. rejected messages&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. Check Mailbox Quotas\u00a0<\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li>For cPanel\/WHM:&nbsp;\/scripts\/setquota&nbsp;<\/li>\n\n\n\n<li>Adjust quotas if mailboxes are full&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. Inspect Attachments &amp; Security\u00a0<\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li>Scan attachments for viruses\/malware&nbsp;<\/li>\n\n\n\n<li>Remove or recreate flagged files&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-optional-automate-scanning-with-clamav-or-similar\"><strong>Optional:<\/strong>&nbsp;Automate scanning with&nbsp;ClamAV&nbsp;or similar:&nbsp;<\/p>\n\n\n\n<pre id=\"htoc-clamscan-r-home-mailuser-maildir\" class=\"wp-block-code\"><code>clamscan&nbsp;-r \/home\/mailuser\/maildir&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>5. Test Sending CLI \/ Size Limits\u00a0<\/strong><\/summary>\n<pre id=\"htoc-swaks-to-recipient-example-com-server-mx-example-com-data-subject-test-n-nattachment-test-attach-largefile-zip\" class=\"wp-block-code\"><code>swaks&nbsp;--to&nbsp;<a href=\"mailto:recipient@example.com\" target=\"_blank\" rel=\"noreferrer noopener\">recipient@example.com<\/a>&nbsp;--server mx.example.com --data \"Subject: Test\\n\\nAttachment&nbsp;test\" --attach largefile.zip&nbsp;<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Confirm recipient server accepts message size&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>6. Monitor Server Resource Limits\u00a0<\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li>High-volume sending may trigger 552 if server enforces per-user or global limits&nbsp;<\/li>\n\n\n\n<li>Adjust Exim\/Postfix message size limits carefully:&nbsp;<\/li>\n<\/ul>\n\n\n\n<pre id=\"htoc-exim-message-size-limit-26214400-25-mb-postfix-message-size-limit-26214400\" class=\"wp-block-code\"><code># Exim&nbsp;<br>message_size_limit = 26214400&nbsp;&nbsp; # 25 MB&nbsp;<br># Postfix&nbsp;<br>message_size_limit = 26214400&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>Before You Move\u00a0On\u00a0\u00a0<\/strong><\/summary>\n<p id=\"htoc-confirm\">Confirm:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Total email size is within limits&nbsp;<\/li>\n\n\n\n<li>Recipient mailbox has enough space&nbsp;<\/li>\n\n\n\n<li>No unsafe attachments are included&nbsp;<\/li>\n\n\n\n<li>Verify no security or virus blocks are triggered&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-then-resend-your-message\">Then resend your 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>Next Recommended Steps\u00a0<\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li>Check full bounce details&nbsp;<\/li>\n\n\n\n<li>Verify the recipient address\u00a0<\/li>\n\n\n\n<li>Compress attachments or use cloud links&nbsp;<\/li>\n\n\n\n<li>Confirm mailbox storage is sufficient&nbsp;<\/li>\n\n\n\n<li>Retry sending&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>If This\u00a0Didn\u2019t\u00a0Work\u00a0<\/strong><\/summary>\n<p id=\"htoc-check-for\">Check for:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IP address blocks&nbsp;<\/li>\n\n\n\n<li>Blacklist warnings&nbsp;<\/li>\n\n\n\n<li>Policy references from recipient servers&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-next-steps\">Next steps:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Remove attachments and resend plain-text email&nbsp;<\/li>\n\n\n\n<li>Confirm SPF\/DKIM are valid&nbsp;<\/li>\n\n\n\n<li>Contact the recipient postmaster if necessary\u00a0<\/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>Common Mistakes to\u00a0Avoid\u00a0<\/strong><\/summary>\n<ul class=\"wp-block-list\">\n<li>Resending without reducing size&nbsp;<\/li>\n\n\n\n<li>Ignoring the recipient mailbox quota\u00a0<\/li>\n\n\n\n<li>Using unsafe attachments repeatedly&nbsp;<\/li>\n\n\n\n<li>Assuming the hosting or website is broken\u00a0<\/li>\n\n\n\n<li>Misinterpreting extended 552 codes&nbsp;<\/li>\n<\/ul>\n\n\n\n<p id=\"htoc-smtp-552-errors-affect-email-delivery-only-not-hosting-domain-registration-or-stored-mailboxes\">SMTP 552 errors affect email delivery only, not hosting, domain registration, or stored mailboxes.&nbsp;<\/p>\n<\/details>\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>Email size limits include encoding overhead (approximately 30%). Always keep messages slightly below&nbsp;maximum&nbsp;limits to ensure delivery.&nbsp;<\/p>\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. Is this error permanent?\u00a0<\/strong><\/summary>\n<p id=\"htoc-yes-usually-a-hard-bounce-action-is-needed-to-resend\">Yes, usually a hard bounce. Action is needed to\u00a0resend.\u00a0<\/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 my hosting or website break?\u00a0<\/strong><\/summary>\n<p id=\"htoc-no-only-the-email-delivery-is-affected\">No, only the email delivery is affected.\u00a0<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Q. How do I know if my email\u00a0exceeded\u00a0size limits or recipient storage?\u00a0<\/strong><\/summary>\n<p id=\"htoc-the-extended-552-code-e-g-5-2-2-5-3-4-provides-the-specific-reason\">The extended 552 code (e.g., 5.2.2, 5.3.4) provides\u00a0the\u00a0specific reason.\u00a0<\/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\/\">SMTP Error Codes<\/a>\u00a0\u00a0<\/strong><br><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-enable-dkim-and-spf-on-your-mail-domain\/\"><strong>SPF\/DKIM Setup Guide\u00a0<\/strong><\/a>\u00a0<br><a href=\"https:\/\/1grid.co.za\/knowledge\/email-restrictions\/\"><strong>Email Sending Limits Guide\u00a0\u00a0<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/why-emails-bounce-back-error-messages-and-how-to-fix-them\/\"><strong>Email Bounce Back Guide\u00a0<\/strong><\/a><\/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 552&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 you\u2019ve received&nbsp;SMTP Error 552, it means your email could not be delivered because it either exceeds the recipient server\u2019s size&nbsp;limit&nbsp;or the recipient\u2019s mailbox storage is full.&nbsp; This guide will:&nbsp; By the end of this guide,&nbsp;you\u2019ll&nbsp;confidently diagnose and resolve SMTP 552 errors without unnecessary support escalation.&nbsp; What SMTP Error 552&nbsp;Means&nbsp;&#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":[1173,1194],"ht-kb-tag":[1514,1755,1754,1753],"class_list":["post-34649","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-email","ht_kb_category-email-troubleshooting","ht_kb_tag-email-troubleshooting","ht_kb_tag-mailbox-quota-exceeded","ht_kb_tag-message-size-exceeded","ht_kb_tag-smtp-error-552"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SMTP Error 552: Message Size or Storage Limit Exceeded (How to Fix It) - 1-grid Knowledge Base<\/title>\n<meta name=\"description\" content=\"Fix SMTP Error 552: Message Size or Storage Limit Exceeded. 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