554
554 Unresolvable From Domain
Yahoo rejected the message because the From domain does not resolve.
If DNS for the visible From domain is missing or misconfigured, Yahoo blocks the message instead of retrying later.
Severity
ERROR
Provider
Yahoo Mail
Last Reviewed
2025-06-01
How to Fix 554
Follow these steps to resolve this Yahoo Mail SMTP error and restore normal delivery.
- ✓Restore authoritative DNS records for the From domain immediately.
- ✓Retire placeholder or test domains from production sends.
- ✓Monitor DNS expiry dates and automate renewal reminders.
- ✓Send from a secondary domain while DNS caches refresh.
Helpful Resources
More Yahoo Mail SMTP Codes
Keep these related troubleshooting guides handy while addressing 554.
Still experiencing Yahoo Mail delivery issues?
Run your domain through our free deliverability tools or book a session with Bento's deliverability specialists.