Gmail and Google Workspace · permanent error
550 5.7.40: no DMARC record, blocked
Gmail rejected the message because the sending domain has no DMARC record, or its record has no policy, which Gmail requires of bulk senders.
- Gmail
- Provider
- Permanent (5xx)
- Class
- Sources checked
- Author
At a glance
- Code
- 550 5.7.40
- Provider
- Gmail and Google Workspace
- Temporary or permanent
- PermanentRefused for good: the message comes back to the sender, and resending it gets the same answer.
- Who has to act
- The sender. The fix is on the sending side: your domain, your server or your list.
- What the server says
550 5.7.40 Your message was blocked because the sending domain doesn't have a DMARC record…
What it means
This is the permanent form of 421 4.7.40. Bulk senders to Gmail must publish a DMARC record for their sending domain, with a policy of at least p=none. This domain has no record, or its record lacks the p= tag, so Gmail rejected the message. Publishing a valid record fixes it: v=DMARC1; p=none meets the requirement, and a rua address brings in the reports you need before tightening the policy. Then send the message again.
Common causes
- No DMARC record is published at _dmarc for the From domain.
- The record is malformed, or lacks the p= policy tag.
- The record sits on the wrong host name, such as the bare domain.
How to fix it
- 01Look up your domain's DMARC record.
- 02Publish a TXT record at _dmarc.yourdomain with at least v=DMARC1; p=none, plus a rua address.
- 03Check that SPF or DKIM aligns with the From domain before tightening the policy.
- 04Resend once the record is live.
Sources
What this page rests on, checked on 20 Oct 2026. The explanation is ours; the reply text is the server's.
- Gmail SMTP errors and codes (Google Workspace Admin Help)knowledge.workspace.google.com
- Email sender guidelines (Gmail Help)support.google.com
Related codes
- 421 4.7.40No DMARC record, rate limited.Gmail is rate limiting your mail because the sending domain has no DMARC record, or its record sets no policy, which Gmail requires of bulk senders.
- 4.7.31No DMARC record, in Google's FAQ.Google's sender guidelines FAQ lists 4.7.31 for mail rate limited because the sending domain has no DMARC record, or has one without a policy.
- 550Mailbox unavailable.The receiving server permanently refused the message for this recipient: the mailbox does not exist, cannot be reached, or the server rejected the message by policy.
Further reading
All 108 Gmail codesEvery code in the wikiPaste your own bounce