[Dovecot] For the record: Postfix+Spamassassin+ClamAV+Dovecot

[Seth Mattinen]

James Butler wrote:
> Postfix 2.5.5
> SpamAssassin 3.2.5 (under Perl 5.10.0)
> ClamAV 0.95.1
> Dovecot 1.2.rc2
> 
> works fine on Fedora 10.
> 
> Installed Dovecot and ClamAV from source and everything else using yum.
> 
> I'm using the ClamAV plugin for Spamassassin:
>  http://wiki.apache.org/spamassassin/ClamAVPlugin
> 
> I'm calling Spamassassin with:
> 
> /etc/postfix/main.cf:
> mailbox_command = /usr/bin/spamc -f -e /usr/local/libexec/dovecot/deliver
> 
> Postfix hands off to Spamassassin, which processes ALL mail (not just
> attachments) through the ClamAV plugin before parsing for spam, and then
> hands the whole mess off to Dovecot for 'deliver' to handle.
> 
> How simple is that?
> 
> Since ClamAV scanns all mail, it might be too processor-intensive for
> really large mail systems, but it is working great for our 120+ user
> system with lots of spam coming in. If you're using Procmail or some other
> preprocessor that can hand off to a pipe, then you could skip the plugin
> and pipe messages over a certain size (i.e. >1024) to clamd, instead.
> 

SpamAssassin is more of a CPU hog than Clam is, although that depends if
you're scanning large files or not. If my mail systems aren't falling
over while running Clam and SA (although I don't use the plugin, I scan
the stream with clamd before SA) the average system should be fine too.

~Seth