ASA 5520 and SMTP

Unanswered Question
May 12th, 2009

There is such scheme:

The Internet (2 providers, bgp) - cisco 3845 - cisco ASA 5520 - an internal network

Thus at equipment interface are used vlan - i.e. ports on cisco work in a mode dot1q and virtual subinterfaces are created.

In an internal network the post server (freebsd 7, postfix) is established.

All scheme works as a whole normally, however occasionally on a mail server at sending of letters on external relays there are messages:

"lost connection with domain.ru [xxx.yyy.zzz.ttt] while receiving the initial server greeting"

And mail does not go.

There is a suspicion that a problem in cisco ASA 5520. Whether someone faced the similar? How to solve this problem?

I have this problem too.
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