554 [PH01]
PH01 Policy Block
Yahoo blocked the campaign because of a policy, blocklist, or DMARC issue.
PH01 often follows Spamhaus listings, DMARC failures, or compromised infrastructure. Yahoo expects proof of remediation before traffic resumes.
Severity
ERROR
Provider
Yahoo Mail
Reference
PH01
Last Reviewed
2025-06-01
How to Fix 554 [PH01]
Follow these steps to resolve this Yahoo Mail SMTP error and restore normal delivery.
- ✓Check public and private blocklists for the sending IP and domain.
- ✓Resolve DMARC alignment issues and publish a policy with reporting.
- ✓Document corrective actions and share them with Yahoo Sender Support.
- ✓Resume with low volume and monitor complaint rates closely.
Helpful Resources
More Yahoo Mail SMTP Codes
Keep these related troubleshooting guides handy while addressing 554 [PH01].
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