451 4.7.0 PRX4

Copper Contributor
Hi we are using exchange server 2013 when we are trying to send mail from application getting error message 451 4.7.0 temporary server error PRX4.
2 Replies

@Harpreet_Singh internal external mail both got this error?



Make sure you check the below things to diagnose the problem


Things to check on application
1. Server name/smarthost?
2. SSL/TLS enabled?
3. Port No?
Things to check on server:
1. Is there a send connector present for those emails?
2. Send connector should have application's IP added in it.
System Admin - Apps4Rent