554
554 Authentication Failure
Yahoo rejected the campaign because SPF and DKIM did not pass at this volume.
High-volume senders must pass SPF and DKIM with DMARC alignment. Continued failures cause Yahoo to bounce rather than defer messages.
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.
- ✓Sign every message with DKIM aligned to the visible From domain.
- ✓Limit SPF to the IP ranges that are actively sending mail.
- ✓Publish a DMARC policy and monitor aggregate reports for gaps.
- ✓Reduce daily volume until authentication passes consistently.
Helpful Resources
More Yahoo Mail SMTP Codes
Keep these related troubleshooting guides handy while addressing 554.
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