450 4.7.0
LPN007_510 Service Refused
Laposte refused the message because of temporary policy or content checks.
LPN007_510 is a soft block triggered by content heuristics or bursts of suspicious traffic. It often precedes harder policy bounces.
Severity
WARNING
Provider
Laposte.net
Reference
LPN007_510
Last Reviewed
2025-06-01
How to Fix 450 4.7.0
Follow these steps to resolve this Laposte.net SMTP error and restore normal delivery.
- ✓Review subject lines, link domains, and attachments for spam traits.
- ✓Ensure authentication (SPF, DKIM, DMARC) passes for the sending domain.
- ✓Throttle bursty campaigns so Laposte can scan the stream gradually.
- ✓Check that localisation (FR language, legal footer) matches French law.
Helpful Resources
More Laposte.net SMTP Codes
Keep these related troubleshooting guides handy while addressing 450 4.7.0.
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