DKIM fail
A DKIM signature was present but did not verify against the published key.
What causes it
- The message body was modified in transit — mailing lists that append footers are the classic cause.
- The published key was rotated or removed while mail signed with the old key was still in flight.
- A mail gateway rewrote headers that were covered by the signature.
- The key record is malformed, or was pasted with line breaks inside the p= value.
How to fix it
Look for "body hash did not verify" in the header — that specifically means the body changed after signing, which points at a list or a gateway rather than at your DNS. If the whole signature fails instead, re-check that the selector record is published exactly as your provider generated it.
Check your domain
Also searched for: dkim=fail, dkim signature invalid, dkim body hash did not verify.