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 …

Continue reading Exchange 2013: Remote host said: 451 4.7.0 Temporary server error. Please try again later. PRX2