users logging on the gateway - smtp

[Lips]

Hello

Can anyone knows if there is any way to make something like this:

I have a network gateway (gentoo) and I would like to gate recorded the users sent e-mails I mean mainly (From: / To: / Date:)

I tried using iptables but not really me coming out.

Has anyone any idea how to do it?

[gerdesj]

If your Gentoo box is relaying (Postfix, Exim, Sendmail etc) then that is simple - read the logs!

It sounds that you want to actually watch the traffic stream and parse out details - good luck with that.

Anyway a quick Google for "transparent proxy smtp" brings up this:

http://thewalter.net/stef/software/clamsmtp/transparent.html

Cheers
Jon