450 4.7.1
LPN027_503 Service Refused
Laposte temporarily refused the connection after seeing too many errors or complaints.
LPN027_503 is Laposte’s generic throttle when reputation drops. It normally clears after a few hours if you slow delivery and clean your list.
Severity
WARNING
Provider
Laposte.net
Reference
LPN027_503
Last Reviewed
2025-06-01
How to Fix 450 4.7.1
Follow these steps to resolve this Laposte.net SMTP error and restore normal delivery.
- ✓Reduce concurrent SMTP connections to no more than two per IP.
- ✓Respect Laposte’s limit of ~100 messages per connection.
- ✓Pause unengaged French recipients and remove obvious spam traps.
- ✓Check the Signal Spam feedback loop for complaint spikes.
Helpful Resources
More Laposte.net SMTP Codes
Keep these related troubleshooting guides handy while addressing 450 4.7.1.
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