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[vox-tech] rejecting spam using tcpwrappers
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[vox-tech] rejecting spam using tcpwrappers



ok, i think i figured this out.  in inetd.conf, i modified the smtp line to
read:

   smtp   stream   tcp   nowait   mail /usr/sbin/tcpd  /usr/sbin/exim -bs

whenever spam arrives, i simply drop the offending host in /etc/hosts.deny.
the reason for this is it seems nicer to reject spam, rather than ignore it
(as you would with a procmail filter).  that way, the spammers know that
you're not listening to them.  by filtering, they never know the difference.

anyway, the only tweak i think i need to make is with logcheck:

Nov 30 11:25:24 exim[7763]: connect from murphy.debian.org
Nov 30 11:26:34 exim[7776]: connect from murphy.debian.org
Nov 30 11:27:19 exim[7787]: connect from foobar.math.fu-berlin.de
Nov 30 11:29:43 exim[7804]: connect from murphy.debian.org
Nov 30 11:32:45 exim[7811]: connect from murphy.debian.org
Nov 30 11:36:28 exim[7822]: connect from murphy.debian.org
Nov 30 11:41:01 exim[7846]: connect from dcn251-11.dcn.davis.ca.us
Nov 30 11:51:49 exim[7870]: connect from ig25.optinrewards.com
Nov 30 11:56:11 exim[7985]: refused connect from femail8.sdc1.sfba.home.com

the wrapper reports each mail connect (and reject).  if anything, i'm only
interested in what sessions get rejected.

other than this, i think this works...

pete

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