postfix 2.1.5 (Mac OS X 10.4.11, Tiger), logging set to debug level:
Out of curiosity, what do empty connect/disconnect pairs in the mail log mean? I.e.:
Mar 19 09:50:19 jupiter postfix/smtpd[1452]: connect from mx3.westat.com[198.232.249.38] Mar 19 09:50:20 jupiter postfix/smtpd[1452]: disconnect from mx3.westat.com[198.232.249.38]
In this example, the user at westat.com was told by his mail server that his email could not be delivered to our mail server. However, I see no indications of errors in the mail log. In the prior minute there were only 5 connects, so load on the box was small.
I see lots of these connect/disconnect pairs in my logs, at least 17% of all connections. Over 99% of westat's connections to our mail server over the last month had this result.
Thanks, Kevin Murphy
