Today I met a strange issue in Exchange 2013 new installation.
Incoming emails were not arrived at the mailboxes. The NDR shows “Remote host said: 451 4.7.0 Temporary server error. Please try again later. PRX2”
I checked everything on the DNS side and no joy !!!
The server used were a multi-role server and found as this is a bug in the program.
The fix is:
1. Create host file entries on the server with two names: server,server.domain.local
2. Restart “Microsoft Frontend Transport” and “Microsoft Exchange Transport” services
After doing the procedure, inbound emails has been arrived suddenly !!!
Hope this will help you if you met issues in Exchange 2013 Multi-role server infrastructure