{"id":26299,"date":"2025-10-03T07:26:14","date_gmt":"2025-10-03T07:26:14","guid":{"rendered":"https:\/\/1-grid.com\/knowledge\/?p=26299"},"modified":"2025-10-06T11:25:16","modified_gmt":"2025-10-06T11:25:16","slug":"resolving-email-error-messages-when-sending-to-gmail-accounts","status":"publish","type":"ht_kb","link":"https:\/\/1grid.co.za\/knowledge\/resolving-email-error-messages-when-sending-to-gmail-accounts\/","title":{"rendered":"Resolving Email Error Messages When Sending to Gmail Accounts"},"content":{"rendered":"\n<p>Gmail is one of the strictest email providers when it comes to<strong> <a href=\"https:\/\/workspace.google.com\/blog\/identity-and-security\/an-overview-of-gmails-spam-filters\" target=\"_blank\" rel=\"noreferrer noopener\">filtering spam<\/a><\/strong>. This means even legitimate emails may sometimes be blocked or delayed. If you\u2019re seeing email error messages when sending to Gmail accounts, there\u2019s no need to worry! This guide will help you understand what\u2019s happening and how to fix it.&nbsp;&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\/2022\/06\/1-grid-Images-for-KB-Articles-1000-x-600-px-36.png\" alt=\"\" class=\"wp-image-33753\"\/><\/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-\">Common Gmail Error Messages&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-1\">Why These Errors Happen&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-1111\">Troubleshooting Checks&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-11111\">Steps to Resolve Error Messages with a TXT (SPF) Record Update via cPanel&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-111111\">Prevention Best Practices&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-111111111\">When to Contact Support&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-111111111111\">FAQs&nbsp;<\/a><\/li><li class=\"\"><a href=\"#htoc-111111111111111111\">Additional Resources&nbsp;<\/a><\/li><\/ul><\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-\"><strong>Common Gmail Error Messages&nbsp;<\/strong><\/h2>\n\n\n\n<p>Gmail has several <a href=\"https:\/\/support.google.com\/mail\/answer\/3726730?hl=en\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>SMTP errors and codes<\/strong><\/a> that may appear, but <strong>we&#8217;ve identified 4 common email error messages when sending to Gmail<\/strong> that you may see:&nbsp;<\/p>\n\n\n\n<p id=\"htoc-message-blocked-this-means-that-gmail-suspects-the-message-or-server-is-spam-550-5-7-1-ip-our-system-has-detected-an-unusual-rate-of-spam-this-indicates-that-gmail-has-blocked-the-ip-or-domain-due-to-reputation-issues-421-4-7-28-this-message-does-not-meet-ipv6-sending-guidelines-the-sender-is-not-compliant-with-the-gmail-ipv6-policy-451-4-7-0-temporary-rate-limit-exceeded-gmail-is-throttling-messages-due-to-volume\"><strong>1. \u201c<a href=\"https:\/\/www.google.com\/search?q=gmail+error+Message+blocked&amp;sca_esv=d1d26e03a6da53f6&amp;rlz=1C1GCEU_enZA1059ZA1063&amp;sxsrf=AE3TifN1Qrdg6nN_J-VI531n-tYdP6Gntg%3A1759393221778&amp;ei=xTXeaI-mL-aghbIP-srfiA8&amp;ved=0ahUKEwjPnITAioWQAxVmUEEAHXrlF_EQ4dUDCBA&amp;uact=5&amp;oq=gmail+error+Message+blocked&amp;gs_lp=Egxnd3Mtd2l6LXNlcnAiG2dtYWlsIGVycm9yIE1lc3NhZ2UgYmxvY2tlZDIFEAAYgAQyCxAAGIAEGJECGIoFMgsQABiABBiRAhiKBTILEAAYgAQYkQIYigUyCxAAGIAEGJECGIoFMgUQABiABDIKEAAYgAQYFBiHAjIFEAAYgAQyBRAAGIAEMgUQABiABEiyIVCaCVi1H3ABeAGQAQCYAe4CoAHPG6oBBTItOC40uAEDyAEA-AEB-AECmAINoAKTHMICChAAGLADGNYEGEfCAgQQIxgnwgIKECMYgAQYJxiKBcICFhAuGIAEGLEDGNEDGEMYgwEYxwEYigXCAhAQABiABBixAxhDGIMBGIoFwgILEAAYgAQYsQMYgwHCAggQABiABBixA8ICDRAAGIAEGLEDGBQYhwKYAwCIBgGQBgiSBwcxLjAuOC40oAfpULIHBTItOC40uAeNHMIHBDItMTPIBzQ&amp;sclient=gws-wiz-serp\" target=\"_blank\" rel=\"noreferrer noopener\">Message blocked<\/a>\u201d\u00a0<\/strong>\u00a0<br>This means that Gmail suspects the message or server is spam.\u00a0<br><br><strong>2. \u201c<a href=\"https:\/\/www.google.com\/search?q=550-5.7.1+%5BIP%5D+Our+system+has+detected+unusual+rate+of+spam&amp;sca_esv=d1d26e03a6da53f6&amp;rlz=1C1GCEU_enZA1059ZA1063&amp;sxsrf=AE3TifMbNOjbPRZiYF2hKUwW95XF8oaOlw%3A1759392732935&amp;ei=3DPeaKfrOP7PhbIP4dfIuQc&amp;ved=0ahUKEwinyffWiIWQAxX-Z0EAHeErMncQ4dUDCBA&amp;uact=5&amp;oq=550-5.7.1+%5BIP%5D+Our+system+has+detected+unusual+rate+of+spam&amp;gs_lp=Egxnd3Mtd2l6LXNlcnAiOzU1MC01LjcuMSBbSVBdIE91ciBzeXN0ZW0gaGFzIGRldGVjdGVkIHVudXN1YWwgcmF0ZSBvZiBzcGFtSJADUABYAHAAeAGQAQCYAQCgAQCqAQC4AQPIAQD4AQL4AQGYAgCgAgCYAwCSBwCgBwCyBwC4BwDCBwDIBwA&amp;sclient=gws-wiz-serp\" target=\"_blank\" rel=\"noreferrer noopener\">550-5.7.1 [IP] Our system has detected an unusual rate of spam<\/a>\u201d\u00a0<\/strong><br>This indicates that Gmail has blocked the IP or domain due to reputation issues.\u00a0<br><br><strong>3. \u201c<a href=\"https:\/\/www.google.com\/search?q=421-4.7.28+This+message+does+not+meet+IPv6+sending+guidelines+&amp;sca_esv=d1d26e03a6da53f6&amp;rlz=1C1GCEU_enZA1059ZA1063&amp;sxsrf=AE3TifMbNOjbPRZiYF2hKUwW95XF8oaOlw%3A1759392732935&amp;ei=3DPeaKfrOP7PhbIP4dfIuQc&amp;ved=0ahUKEwinyffWiIWQAxX-Z0EAHeErMncQ4dUDCBA&amp;uact=5&amp;oq=421-4.7.28+This+message+does+not+meet+IPv6+sending+guidelines+&amp;gs_lp=Egxnd3Mtd2l6LXNlcnAiPjQyMS00LjcuMjggVGhpcyBtZXNzYWdlIGRvZXMgbm90IG1lZXQgSVB2NiBzZW5kaW5nIGd1aWRlbGluZXMgSJMDUABYAHAAeAGQAQCYAbsCoAG7AqoBAzMtMbgBA8gBAPgBAvgBAZgCAKACAJgDAJIHAKAHcrIHALgHAMIHAMgHAA&amp;sclient=gws-wiz-serp\" target=\"_blank\" rel=\"noreferrer noopener\">421-4.7.28 This message does not meet IPv6 sending guidelines<\/a>\u201d<\/strong>\u00a0<br>The sender is not compliant with the<strong> <a href=\"https:\/\/support.google.com\/a\/answer\/81126?hl=en\" target=\"_blank\" rel=\"noreferrer noopener\">Gmail IPv6 policy<\/a><\/strong>.\u00a0<br><br><strong>4. \u201c<a href=\"https:\/\/www.google.com\/search?q=451+4.7.0+Temporary+rate+limit+exceeded&amp;sca_esv=d1d26e03a6da53f6&amp;rlz=1C1GCEU_enZA1059ZA1063&amp;sxsrf=AE3TifPMd4mWqtx4wjUD189AgIfgZyM2vQ%3A1759392632981&amp;ei=eDPeaIzYO7euhbIPuKDD2Q0&amp;ved=0ahUKEwiM9KKniIWQAxU3V0EAHTjQMNsQ4dUDCBA&amp;uact=5&amp;oq=451+4.7.0+Temporary+rate+limit+exceeded&amp;gs_lp=Egxnd3Mtd2l6LXNlcnAiJzQ1MSA0LjcuMCBUZW1wb3JhcnkgcmF0ZSBsaW1pdCBleGNlZWRlZDIKEAAYsAMY1gQYRzIKEAAYsAMY1gQYRzIKEAAYsAMY1gQYRzIKEAAYsAMY1gQYRzIKEAAYsAMY1gQYRzIKEAAYsAMY1gQYRzIKEAAYsAMY1gQYRzIKEAAYsAMY1gQYR0jECVD7Blj7BnABeAGQAQCYAQCgAQCqAQC4AQPIAQD4AQL4AQGYAgGgAguYAwCIBgGQBgiSBwExoAcAsgcAuAcAwgcDMy0xyAcJ&amp;sclient=gws-wiz-serp\" target=\"_blank\" rel=\"noreferrer noopener\">451 4.7.0 Temporary rate limit exceeded<\/a>\u201d\u00a0<\/strong><br>Gmail is throttling messages due to volume.\u00a0<\/p>\n\n\n\n<ol class=\"wp-block-list\"><\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-1\"><strong>Why These Errors Happen&nbsp;<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-11\">Gmail blocks suspicious or bulk senders to protect users.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-missing-or-incorrect-authentication-spf-dkim-dmarc\">Missing or incorrect authentication (<a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-enable-dkim-and-spf-on-your-mail-domain\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>SPF<\/strong><\/a>, <a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-enable-dkim-and-spf-on-your-mail-domain\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>DKIM<\/strong><\/a>, <a href=\"https:\/\/1grid.co.za\/knowledge\/cpanel-how-to-add-dmarc-record\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>DMARC<\/strong><\/a>).&nbsp;<\/li>\n\n\n\n<li id=\"htoc-domain-or-server-flagged-by-mailchannels-for-spam-like-activity\">Domain or server flagged by <a href=\"https:\/\/1grid.co.za\/knowledge\/?s=Mailchannels&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>MailChannels<\/strong><\/a> for <a href=\"https:\/\/1grid.co.za\/knowledge\/blocked-via-mailchannels-due-to-spam\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>spam-like activity<\/strong><\/a>.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-111\">Invalid recipient addresses.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-1111\"><strong>Troubleshooting Checks&nbsp;<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-check-the-error-code-carefully-as-this-will-tell-you-why-gmail-rejected-the-email\"><a href=\"https:\/\/support.google.com\/a\/answer\/3726730?hl=en\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Check the error code<\/strong><\/a><strong> carefully,<\/strong> as this will tell you why Gmail rejected the email.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-then-verify-spf-and-dkim-records-are-enabled-to-ensure-that-these-are-working-correctly\"><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-enable-dkim-and-spf-on-your-mail-domain\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Verify SPF and DKIM records<\/strong><\/a><strong> are enabled<\/strong> to ensure that these are working correctly.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-next-clean-up-your-mailing-list-by-removing-invalid-or-inactive-addresses\"><strong>Clean up your mailing list<\/strong> by removing invalid or inactive addresses.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-avoid-sending-suspicious-content-such-as-not-using-spammy-words-particularly-in-subject-lines-and-content-that-contains-phrases-like-free-urgent-cash-guaranteed-prize-no-catch-and-limited-supplies-excessive-links-or-suspicious-attachments\"><strong>Avoid sending suspicious content,<\/strong> such as not using spammy words, particularly in <strong><a href=\"https:\/\/www.google.com\/search?sca_esv=d1d26e03a6da53f6&amp;rlz=1C1GCEU_enZA1059ZA1063&amp;cs=0&amp;sxsrf=AE3TifP1DUyzrAVFXE8hyPoB9PagwvmR0A%3A1759393659952&amp;q=subject+lines&amp;sa=X&amp;ved=2ahUKEwibmNqQjIWQAxXkzQIHHdPJD2YQxccNegQIAhAC&amp;mstk=AUtExfA7uuz5n03svIH40GtlpDZvgIo7ZVZAMRXJAdLB4oSu2u3cpHyR5eCnp-6LT487yuSD8Jc5YrFeWOT14eeK1yKUgkmo5pGMbOjDtznLmMJE5oqwEfPdGF-6BBiPfmWRzAUZTd3BxjxznbGtbmJbPcKbpASzsDfdfKF0hdzoP-WJNmdEicM5sryIuh4iUO9CMiE_CA0_9TE37f9EsClhFMnvIdKDCrQofyKYDDoWC0inE08Y1CQ8F0rraUYX8RdQec6vySI-VoZKMV2ysBUYdTwcfq-Yn8unHU_9stV3fhk3bQ&amp;csui=3\" target=\"_blank\" rel=\"noreferrer noopener\">subject lines<\/a> <\/strong>and content that contains phrases like &#8220;free,&#8221; &#8220;urgent,&#8221; &#8220;cash,&#8221; &#8220;guaranteed,&#8221; &#8220;prize,&#8221; &#8220;no catch,&#8221; and &#8220;limited supplies&#8221;, excessive links, or suspicious attachments.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-check-the-mailchannels-status-and-if-the-mail-has-been-blocked-you-need-to-review-it-before-resending\"><a href=\"https:\/\/1grid.co.za\/knowledge\/mailchannels-errors-codes\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Check the MailChannels status<\/strong><\/a><strong>,<\/strong> and if<strong> <\/strong>the <a href=\"https:\/\/1grid.co.za\/knowledge\/blocked-via-mailchannels-due-to-spam\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>mail has been blocked<\/strong><\/a>, you need to <strong><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-avoid-mailchannels-blocks\/\" target=\"_blank\" rel=\"noreferrer noopener\">review it<\/a> <\/strong>before resending.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-next-run-a-domain-test-by-using-google-postmaster-tools-or-mail-tester-com-to-see-if-gmail-flags-your-domain\"><strong>Next, run a domain test<\/strong> by using <a href=\"https:\/\/gmail.com\/postmaster\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Google Postmaster Tools<\/strong><\/a> or <strong><a href=\"https:\/\/www.mail-tester.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">mail-tester.com<\/a> <\/strong>to see if Gmail flags your domain.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-11111\"><strong>Steps to Resolve Error Messages with a TXT (SPF) Record Update via cPanel&nbsp;<\/strong><\/h2>\n\n\n\n<p>Updating the <a href=\"https:\/\/1grid.co.za\/knowledge\/cpanel-how-to-setup-an-spf-record\/\"><strong>SPF record<\/strong><\/a> should help to eliminate email error messages when sending to Gmail.&nbsp;<\/p>\n\n\n\n<p><span style=\"color: #000000;\"><strong dir=\"ltr\">1.<\/strong>&nbsp;Log in to <a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-log-in-to-cpanel-via-your-1-grid-customer-zone\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>cPanel<\/strong><\/a>.<\/span><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><img decoding=\"async\" src=\"https:\/\/s3.amazonaws.com\/cdn.freshdesk.com\/data\/helpdesk\/attachments\/production\/33090665200\/original\/7EA_yHAR4L_EdhTBXAwg4_16FtFJIIBZVQ.png?1675065663\" alt=\"\" style=\"width:239px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<p><span style=\"color: #000000;\"><strong>2.<\/strong>&nbsp;Click on <strong>Zone Editor<\/strong>.<\/span><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><img decoding=\"async\" src=\"https:\/\/s3.amazonaws.com\/cdn.freshdesk.com\/data\/helpdesk\/attachments\/production\/33092906385\/original\/sYdA8VBoGPMlLNvQNsHqGhw1vFu5MZjxUQ.png?1678703713\" alt=\"\" style=\"width:455px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<p><span style=\"color: #000000;\"><strong>3.<\/strong>&nbsp;Click on <strong>Manage<\/strong><\/span>.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><img decoding=\"async\" src=\"https:\/\/s3.amazonaws.com\/cdn.freshdesk.com\/data\/helpdesk\/attachments\/production\/33090665303\/original\/7ihwPsCd3Km0VK23RIVM1Gcuo7PNxwl_kg.png?1675065844\" alt=\"\" style=\"width:549px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<p><span style=\"color: #000000;\"><strong>4.<\/strong>&nbsp;Click on <strong>TXT<\/strong><\/span>.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><img decoding=\"async\" src=\"https:\/\/s3.amazonaws.com\/cdn.freshdesk.com\/data\/helpdesk\/attachments\/production\/33090665369\/original\/ZG2OWrG8o2O57q-qEmbyEWopDx9gTdFEOg.png?1675065919\" alt=\"\" style=\"width:470px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<p><span style=\"color: #000000;\"><strong> 5.<\/strong>&nbsp;Click on<strong> Edit<\/strong><\/span>.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><img decoding=\"async\" src=\"https:\/\/s3.amazonaws.com\/cdn.freshdesk.com\/data\/helpdesk\/attachments\/production\/33090665417\/original\/b4MFk91UNZwnW3rlW7-spwmKlnNbLwS3Ow.png?1675066009\" alt=\"\" style=\"width:483px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<p><span style=\"color: #000000;\"><strong>6.<\/strong>&nbsp;You can then <strong>add the standard SPF record<\/strong> (<em>v=spf1 a mx include:relay.mailchannels.net ~all<\/em>)<\/span><\/p>\n\n\n\n<p><span style=\"color: #000000;\"><span dir=\"ltr\"><strong>NOTE:<\/strong>&nbsp;If an SPF record already exists, you can replace it with the record below:&nbsp;<\/span><\/span><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><span dir=\"ltr\">v=spf1 a mx include:relay.mailchannels.net ~all<\/span><\/pre>\n\n\n\n<p><strong>7. <\/strong><span style=\"color: #000000;\">Click <strong>Save Record<\/strong>.<\/span><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><img decoding=\"async\" src=\"https:\/\/s3.amazonaws.com\/cdn.freshdesk.com\/data\/helpdesk\/attachments\/production\/33090665674\/original\/rSUMRoC_B-Wyme9NtzfRcH-82iiEZIuBFw.png?1675066337\" alt=\"\" style=\"width:514px;height:auto\"\/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-111111\"><strong>Prevention Best Practices&nbsp;<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-1111111\">Keep your <strong><a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-a-domain-name-server-dns\/\">DNS records<\/a> <\/strong>updated and rotate keys.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-avoid-bulk-sending-without-verified-mailing-tools\"><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-resolve-mailchannels-error-550-too-many-invalid-recipients\/\">Avoid bulk sending<\/a> <\/strong>without <a href=\"https:\/\/1grid.co.za\/knowledge\/mailchannels-errors-codes\/\"><strong>verified mailing tools<\/strong><\/a>.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-monitor-mailchannels-reports-regularly\">Monitor <strong><a href=\"https:\/\/1grid.co.za\/knowledge\/mailchannels-errors-codes\/\">MailChannels<\/a> <\/strong>reports regularly.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-11111111\">Educate team members on safe sending practices.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-111111111\"><strong>When to Contact Support&nbsp;<\/strong><\/h2>\n\n\n\n<p>If you\u2019ve checked the records, cleaned your lists, and followed the steps above, but you are still receiving email error messages when sending to Gmail, you can reach out to 1-grid Support with:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li id=\"htoc-1111111111\">The full bounce-back error.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-your-domain-name-and-recent-changes\">Your domain name and recent changes.&nbsp;<\/li>\n\n\n\n<li id=\"htoc-11111111111\">Confirmation that <strong><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-enable-dkim-and-spf-on-your-mail-domain\/\">SPF\/DKIM<\/a> <\/strong>are enabled (preferably a screenshot).&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-111111111111\"><strong>FAQs&nbsp;<\/strong><\/h2>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Why does Gmail block my emails, but other providers don\u2019t?<\/strong><\/summary>\n<p id=\"htoc-1111111111111\">Gmail applies stricter filters and reputation checks compared to many other providers.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Will setting up SPF and DKIM fix Gmail blocks completely?<\/strong><\/summary>\n<p id=\"htoc-11111111111111\">They greatly reduce the chance of blocks, but Gmail also looks at sender reputation and message content.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>How long does a MailChannels block last?<\/strong><\/summary>\n<p id=\"htoc-111111111111111\">It can last until sending practices improve and the block is lifted.&nbsp;<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>What should I do if I see \u201c550 Too Many Invalid Recipients\u201d?<\/strong><\/summary>\n<p id=\"htoc-1111111111111111\">Clean up your contact list and ensure you only send to <a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-resolve-mailchannels-error-550-too-many-invalid-recipients\/\"><strong>valid, opted-in addresses<\/strong><\/a>.<\/p>\n<\/details>\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Can I prevent this from happening again?<\/strong>&nbsp;<\/summary>\n<p id=\"htoc-11111111111111111\">Yes, you can by keeping your domain authenticated, sending responsibly, and monitoring your reputation regularly.<\/p>\n<\/details>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-111111111111111111\"><strong>Additional Resources&nbsp;<\/strong><\/h2>\n\n\n\n<p><a href=\"https:\/\/1grid.co.za\/knowledge\/email-security-how-to-prevent-emails-from-landing-in-spam-folders-or-getting-a-bounce-back-error-message\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Preventing Bounce-Backs or Emails Landing in Spam When Sending to Gmail<\/strong><\/a><br><a href=\"https:\/\/support.google.com\/a\/answer\/3726730?hl=en\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Gmail SMTP Errors and Codes<\/strong><\/a><br><a href=\"https:\/\/support.google.com\/a\/answer\/81126?hl=en\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Gmail IPv6 Policy<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/mailchannels-errors-codes\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Mailchannels Error Codes<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-avoid-mailchannels-blocks\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>How to Avoid MailChannels Blocks<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/blocked-via-mailchannels-due-to-spam\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Blocked via Mailchannels Due to Spam<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=mailchannels&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>MailChannels FAQs<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-log-in-to-cpanel-via-your-1-grid-customer-zone\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>How to Log In to cPanel via Your 1-grid Customer Zone<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/setting-up-email-in-outlook-via-windows-control-panel\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Setting Up Email in Outlook via Windows Control Panel<\/strong><\/a><strong>&nbsp;<\/strong><br><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-set-up-email-on-android-for-your-1grid-email-accounts\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>How to Set Up Email on Android for Your 1-grid Email Accounts<\/strong><\/a><strong>&nbsp;<\/strong>&nbsp;<br><a href=\"https:\/\/1grid.co.za\/knowledge\/settings-to-configure-your-1grid-email-accounts-across-devices\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Settings to Configure Your 1-grid Email Accounts Across Devices<\/strong><\/a><strong>&nbsp;&nbsp;<\/strong>&nbsp;<br><a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-email-spoofing\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>What Is Email Spoofing? How It Works and How to Protect Yourself&nbsp;<\/strong><\/a>&nbsp;&nbsp;<br><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-spot-a-scam-email\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>How to Spot a Scam Email: Phishing, Spoofing and Red Flags<\/strong><\/a><strong>&nbsp;<\/strong>&nbsp;<br><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=email+headers&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Email Headers FAQs<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=email&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Email FAQs<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-enable-dkim-and-spf-on-your-mail-domain\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>How to Enable DKIM and SPF on Your Mail Domain<\/strong><\/a><strong>&nbsp;<\/strong>&nbsp;<br><a href=\"https:\/\/1grid.co.za\/knowledge\/why-ssl-the-purpose-of-using-ssl-certificates\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Why SSL? The Purpose of Using SSL Certificates<\/strong><\/a><br><a href=\"https:\/\/1grid.co.za\/knowledge\/what-is-a-domain-name-server-dns\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>What is a Domain Name Server (DNS)?<\/strong><\/a>&nbsp;<br><a href=\"https:\/\/1grid.co.za\/knowledge\/how-to-update-your-domains-nameservers-at-1-grid\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>How to Update Your Domain\u2019s Nameservers at 1-grid<\/strong><\/a><strong>&nbsp;<\/strong><br><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=mailchannels&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><strong><a href=\"https:\/\/1grid.co.za\/knowledge\/?s=spamtitan&amp;ht-kb-search=1&amp;lang=\" target=\"_blank\" rel=\"noreferrer noopener\">SpamTitan FAQs<\/a>&nbsp;<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"htoc-1111111111111111111\"><strong>Need Additional Support?&nbsp;<\/strong><\/h2>\n\n\n\n<p><strong>We&#8217;re Here to <\/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 Gmail error messages and figuring out how to fix them doesn\u2019t have to feel so technical with this easy-to-reference guide. Stuck? Contact our Support Team for clarity and guidance (<a href=\"https:\/\/1grid.co.za\/contact-us\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>https:\/\/1grid.co.za\/contact-us\/<\/strong><\/a>). We&#8217;re ready to see how we can help!&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gmail is one of the strictest email providers when it comes to filtering spam. This means even legitimate emails may sometimes be blocked or delayed. If you\u2019re seeing email error messages when sending to Gmail accounts, there\u2019s no need to worry! This guide will help you understand what\u2019s happening and&#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":[1173,1193,1194],"ht-kb-tag":[1233,1486,336,369,1487,447,480,598,622,849,1287,942,943,1024,1046,1234],"class_list":["post-26299","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-email","ht_kb_category-email-setup-config","ht_kb_category-email-troubleshooting","ht_kb_tag-accounts","ht_kb_tag-deliverability","ht_kb_tag-email","ht_kb_tag-error","ht_kb_tag-error-messages","ht_kb_tag-gmail","ht_kb_tag-how-to","ht_kb_tag-mailchannels","ht_kb_tag-messages","ht_kb_tag-resolve","ht_kb_tag-sending","ht_kb_tag-spf","ht_kb_tag-spf-record","ht_kb_tag-to","ht_kb_tag-troubleshooting","ht_kb_tag-when"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Resolving Email Error Messages When Sending to Gmail Accounts<\/title>\n<meta name=\"description\" content=\"Troubleshoot email error messages when sending to Gmail. 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