Anti-spam methods (was: Re: [SLL] this list losing mail?)

[Bill Campbell]

On Fri, Jul 27, 2007, Glenn Stone wrote:
>On Fri, Jul 27, 2007 at 10:19:21AM -0700, Dan Wilder wrote:
>>On Thu, Jul 26, 2007 at 02:15:59PM -0500, Jeremy C. Reed wrote:
>>> Why does the linux-list mail server lose mails instead of bouncing? Or are 
>>> they waiting for moderation?
>>
>>Spamfiled on a false positive on the way thru mxlogic.net, the MX
>>provider?
>>
>>Bouncing suspected spams has never been The Way To Go ... too much
>>collateral damage.
>
>If you can bounce it during the session, it's fine... but, definitely,
>bouncing after QUIT using the info available in the headers... bad juju.  
>
>Which is one reason I haven't implemented system-wide  content
>filtering... I haven't figured out a good way to link Bayesian filtering
>into the SMTP session with Postfix (there's some milter stuff out there, but
>I haven't been able to get it to work right yet), and frankly I'd rather
>just eyeball the 10% or so that gets through and maybe do some Bayesian in
>procmail than try to maintain something system-wide... 

I've been using a spamassassin plug-in with Mailman for several
years now, and it's worked very well.  I get several notices a
day of messages that have been held for moderator approval as
they have high spamassassin scores, and perhaps one or two spam
messages in the last year have gotten through to lists.

I would never use an MX forwarder that I don't control filtering traffic to
our primary MX (but then I don't have any MX forwarders that I don't
control :-).

...
Bill
--
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