SMTPSEND.DNS.NonExistentDomain
my customer ran into a problem that his exchange server just didn't receive any mail no more or couldn't send mail also. when i checked the mail queue i found the following error: 451 4.4.0 DNS query failed. The error was: SMTPSEND.DNS.NonExistentDomain; nonexistent domain after checking everything from connectors and exchange settings, I started to check just everything, and the first steps i always do is: are the TCP/ip config correct on your network card(s). turns out the DNS 2 entry was set to external dns 8.8.8.8 once you remove this DNS entry and only use the internal DNS server everything [...]