On Oct 6, 2006, at 1:11 PM, Dominik Zalewski wrote:
I just want to capture all smtp/pop3 traffic in packets level.

OK:

  tcpdump -w /var/log/mailarchive.dump -s 0 port smtp or port pop3

But be aware that you should disclose the existence of this mail monitoring to all users, consult your local laws about electronic wiretapping, or both. In some countries or states, doing the above without notification and/or the permission of at least one party is likely to be against the law...

[ This probably belongs on freebsd-questions@, or in a discussion with your lawyer. ]

--
-Chuck

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