We're seeing an issue with SMTP connections. It takes more than a minute for each command to complete. This isn't just the initial SMTP connection, which si also terribly slow, it's also the individual SMTP commands (HELO, MAIL FROM, RCPT TO) that all take more than a minute to produce a response.
The odd thing is this only happens on the real IP of the box. If I'm on the box and try to telnet to the IP, I get the slowness. If I try and telnet to localhost, port 25, it's really fast, like usual.
We're restarted the services and the box, but nothing helped. We haven't made any changes to the box before we started seeing this, and there's nothing really in `omshowlog`.
Any suggestions? I've tried the various forward and backwards DNS lookups, and everythings fast.
Thanks,
-jon