Best practice: Spam-filtering outgoing e-mail

Hi,

we are trying to mitigate the impact of having infected users, brute
force hacked webmail accounts etc. sending (larging amounts of) outbound
spam.

The best idea we've come up with so far is to perform outbound spam
filtering following these rules (it's a bit more complicated than this,
but this is the big picture):

- Spam scoring (Spamassassin). If spam:
- Put the mail on hold
- Add an iptables rule rejecting the IP
- Notify postmaster/abuse

This is relatively easy to accomplish technically. However I would like
some input on what methods people out there use to combat/minimize
outbound spam.

Also, if anyone out there has implemented something similar (or not
similar :) ) to what's described above, I'd love to hear about it.

Thanks!

-- Vegard Svanberg <vegard@svanberg.no> [*Takapa@IRC (EFnet)]

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