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Date:      Mon, 29 Dec 2003 10:01:01 +0000
From:      Jez Hancock <jez.hancock@munk.nu>
To:        Brent Bailey <misterb@bmyster.com>
Cc:        questions@freebsd.org
Subject:   Re: The best Anti spam - Anti virus email solution
Message-ID:  <20031229100101.GB25036@users.munk.nu>
In-Reply-To: <2104.65.162.190.4.1072621896.squirrel@new.host.name>
References:  <2104.65.162.190.4.1072621896.squirrel@new.host.name>

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On Sun, Dec 28, 2003 at 09:31:36AM -0500, Brent Bailey wrote:
> Hello,
> Im looking for you thoughts and opinions on Anti -Spam and Anti virus
> solutions for email servers. Im getting ready to implement a email server
> solution for an ISP. Im very use to sendmail  as ive been able to compile
> sendmail to do rbl checks and use access.db and procmail filtering and
> spamassassin
> and it seems to work pretty good..although there does seem to be a small
> amount of  "false positives" I suppose this is going to happen to some
> extent.
> So im looking to this mailing list to get your opinions and thoughts on
> this. Im more than open to the idea of useing something other than
> sendmail :-)
You may have more joy asking on freebsd-isp if this is indeed for an ISP
setup.

I've heard that clamd(?) is supposed to be good for virus scanning on
the OSS side or sophos for a paid solution, although how these scale for
ISP performance I don't know.

You already mentioned spamassassin which I think is fairly standard, but
again I don't know how it would scale for large numbers of users.  Also
you'd have to consider your privacy policy and whether you want to
completely drop all mail very likely to be spam or whether you just want
to rewrite the 'subject:' header to indicate that the mail might be
spam.

As an ISP user I'm not sure I'd like my ISP to just delete emails
automaticaly on my behalf (even though as a mail server admin I do know
that dropping mails that have an SA score of over say 30 are very very
unlikely to contain spam).  Again this is something to think about in 
your privacy policy I suppose.


-- 
Jez Hancock
 - System Administrator / PHP Developer

http://munk.nu/
http://jez.hancock-family.com/  - personal weblog
http://ipfwstats.sf.net/        - ipfw peruser traffic logging



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