554
554 Unresolvable Return Path
Yahoo could not resolve the envelope From (Return-Path) domain.
If the bounce domain in the envelope From lacks DNS or authentication alignment, Yahoo interprets it as spoofing and rejects the mail.
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.
- ✓Publish A/AAAA and MX records for the bounce domain.
- ✓Ensure SPF covers the Return-Path host and matches the visible From domain.
- ✓Double-check the MTA configuration for typos or legacy hostnames.
- ✓Avoid mixing ESP-provided Return-Paths with self-hosted IPs.
Helpful Resources
More Yahoo Mail SMTP Codes
Keep these related troubleshooting guides handy while addressing 554.
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