To whom this concerns
Diagnostic information for administrators:
Generating server: mail.xxxxxxxxxxx.co.nz
Receiving server: mx.snap.net.nz (202.37.100.100)Remote Server at mx.snap.net.nz (202.37.100.100) returned '400 4.4.7 Message delayed'
12/07/2018 1:45:52 p.m. - Remote Server at mx.snap.net.nz (202.37.100.100) returned '451 4.4.0 Primary target IP address responded with: "451 5.7.3 Require basic authentication." Attempted failover to alternate host, but that did not succeed. Either there are no alternate hosts, or delivery failed to all alternate hosts. The last endpoint attempted was 202.37.100.100:25'
NEED THIS FIX as no email is going out from my exchange server as result of his.