Email error codes
What your bounce message means.
Gmail, Microsoft and Yahoo now reject mail that can't prove where it came from. Find the code from your bounce below: each page says what it means, what usually causes it, and how to fix it.
Gmail
- 550 5.7.26 — “the sender is unauthenticated”
- 550 5.7.26 — “not accepted due to domain's DMARC policy”
- 550 5.7.26 — “SPF record with a hard fail policy (-all)”
- 550 5.7.25 — “doesn't have a PTR record”
- 550 5.7.27 — “Gmail requires bulk email senders to authenticate”
- 550 5.7.40 — “doesn't have a DMARC record”
Outlook.com
- 550 5.7.515 — “does not meet the required authentication level”
Microsoft 365
- 550 5.7.509 — “has a DMARC policy of reject”
Yahoo and AOL
- 554 5.7.9 — “Message not accepted for policy reasons”
Not sure which records are wrong?
The free email check reads your domain's SPF, DKIM, DMARC and mail-server records in a few seconds and explains what it finds. Nothing is stored.