I'm having a strange email issue. Basically, my company can receive most external emails just fine, but
when emails are sent from one particular external domain, the emails get bounced back to the sender SLOOOWLY.
After several days, the sender will receive an email that says something like this:
TLS Connect failed. connected to xyz.ab.de.fg
I'm not going to try again; this message has been in the queue too long.
The same emails are delivered properly to gmail accounts.
the MX records appear to be fine and I notice no other issues in the logs of our
firewall or exchange server (we're using Exchange 2003).
We thought this might be a TLS issue, but we are receiving TLS-encrypted emails from other domains, so I'm not sure that's the issue.
I've seen similar questions on experts-exchange, but without satisfactory resolution.
Any ideas as to what/where to test?
I'm not a sysadmin/exchange expert...it's just a job I inherited, so go easy!