550 5.7.1
LPN007_517 DMARC Policy Reject
Laposte rejected the message because DMARC alignment failed under a reject policy.
Laposte strictly enforces DMARC. Messages that fail alignment with a p=reject policy are blocked outright to protect subscribers.
Severity
ERROR
Provider
Laposte.net
Reference
LPN007_517
Last Reviewed
2025-06-01
How to Fix 550 5.7.1
Follow these steps to resolve this Laposte.net SMTP error and restore normal delivery.
- ✓Ensure SPF or DKIM (preferably both) pass and align with the visible From domain.
- ✓Review DMARC aggregate reports to identify misaligned vendors or streams.
- ✓Provide subdomain-specific authentication when different teams send mail.
- ✓Temporarily relax DMARC to p=quarantine while you diagnose alignment gaps.
Helpful Resources
More Laposte.net SMTP Codes
Keep these related troubleshooting guides handy while addressing 550 5.7.1.
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