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Deliverability Letter

554 5.7.1

554 5.7.1 DMARC Failure

DMARC Failure

Apple rejected the message because DMARC alignment failed with a reject policy.

If either SPF or DKIM fails alignment and the DMARC policy is set to reject, Apple blocks the message to prevent spoofing.

Severity

ERROR

Provider

Apple Mail (iCloud)

Last Reviewed

2025-06-01

How to Fix 554 5.7.1

Follow these steps to resolve this Apple Mail (iCloud) SMTP error and restore normal delivery.

  • ✓Confirm at least one of SPF or DKIM passes with alignment.
  • ✓Ensure subdomain mail streams have their own aligned authentication.
  • ✓Inspect DMARC failure reports for third-party senders using your domain.
  • ✓Roll back to p=quarantine temporarily while issues are resolved.

Helpful Resources

More Apple Mail (iCloud) SMTP Codes

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