I seem to be having a problem with receiving SMTP mail from some mail servers. The majority of servers seems fine but some cannot send mail to us via SMTP. We've investigated one case where someone cannot get an email through to us. We can see the mail server connect because we see the IP address listed in the var/secure log. Then nothing seems to happen. It then reconnects every minute for a while until it gives up. Is there any way of increasing the logging to see what's happening? There's nothing in the psa maillog. Unfortunately we cannot get much information from their end. The AOL SMTP server bounces the mail stating that it was deferred and it gave up aftter 2 hours. No other error information. I heard of another company that had problems getting mail to one of the domains on our server. They knew we were using qmail and apparently made some changes to their server configs to get mail through. Any ideas? The server's not overloaded in any way. It happens when there's hardly anything going through. Very odd that it seems to be some servers and not others.