I need to know if Exchange servers require the “Register this connection’s addresses in DNS” box to be checked as long as DNS was manually updated with the server’s IP.
We never check this box for any of our other servers as we always manually update our DNS.
We recently experienced an issue where email was building up on mail queue to the cloud on our Hybrid server. The Last error = 451 4.4.0 DNS query failed. The error was: DNS query failed with error ErrorRetry.
We just started getting this issue in the last two weeks and the Register address in DNS box had not been checked since server was created several months ago.