450 4.1.7
LPN007_411 MX Misconfiguration
Laposte could not resolve the MX records for the sender domain.
Laposte expects domains that send mail to also receive mail. Missing or incorrect MX records trigger LPN007_411.
Severity
WARNING
Provider
Laposte.net
Reference
LPN007_411
Last Reviewed
2025-06-01
How to Fix 450 4.1.7
Follow these steps to resolve this Laposte.net SMTP error and restore normal delivery.
- ✓Publish MX records for the sender domain—even if you only receive mail on a subdomain.
- ✓Check for DNS typos or expired registrar settings.
- ✓Use monitoring to alert you when MX records change or disappear.
- ✓Fallback to a domain with verified MX records while remediation is underway.
Helpful Resources
More Laposte.net SMTP Codes
Keep these related troubleshooting guides handy while addressing 450 4.1.7.
Still experiencing Laposte.net delivery issues?
Run your domain through our free deliverability tools or book a session with Bento's deliverability specialists.