Yes that is what my post said too, are you using amavisd, spamassassin with your setup up? I was going to try to set my email system with no amavisd and spamassassin to see if that stops the error. It only seems to happen when there is a heavy load on the system - that is more load than it can handle. The system does about 20,000 emails a day which does not seam alot. We have actually two postfix servers. an smtp and mail system. the smtp server sends just fine, except for sending to the mail server where it backs up untill we restart postfix. The mail server just stops receiving email like I started with the posting. I am still confused why postfix would stop like it does. I am going to try the debug_peer_list = 127.0.0.1 like Theo suggests, I am really thinking of installing sendmail to see if that fixes my problem.