Errors
Email & DNS Error Message Fixes
Copy the exact error message you're seeing. Find the cause and the fix.
DMARC Policy None
Monitoring mode — failures visible but not blocked.
SPF PermError
Too many lookups or invalid SPF syntax.
DKIM Signature Failed
Key mismatch, wrong selector, or altered body.
DMARC Alignment Failed
From: domain doesn't match SPF or DKIM domain.
Emails Going to Spam
Reputation, auth, and content signals.
Blacklisted IP
Delisting and warming sending IP.
550 5.7.1 Rejected
Common SMTP rejection codes and fixes.
DKIM None
No DKIM signature on the message.
PTR Mismatch
Reverse DNS doesn't forward-resolve to sending IP.
No MX Record
Domain can't receive mail — add or fix MX.