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Re: Cygwin anti-spam techniques
- From: Christopher Faylor <cgf-use-the-mailinglist-please at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Thu, 25 Jan 2007 22:44:10 -0500
- Subject: Re: Cygwin anti-spam techniques
- References: <45B97009.firstname.lastname@example.org>
- Reply-to: cygwin-talk at cygwin dot com
On Thu, Jan 25, 2007 at 07:05:45PM -0800, Jim Kleckner wrote:
>The presence of a little bit of spam on this list reminds
>me how little normally gets through.
>I know it might be considered a little OT, but do you have
>a pointer to what techniques are used these days?
mlcheck - a homegrown filter which stops certain types of predictable
spam from coming through if it clears the above. This is the program
which stops html mail and various "harmful" attachments. It operates in
a slightly more relaxed mode if you're subscribed.
I use a bunch of "rules du jour" rules with spamassassin:
and will be adding a couple more soon.
spamassassin is run during the smtp connection phase courtesy of qpsmtpd. I
use a number of spam blocks in qpsmtpd, too.
But, actually, despite all of the above, I think the thing that keeps
the lists relatively spam free is my constant retraining of both the
spamassassin bayes filter and the mlcheckd keyword filter. I update
those 5-10 times a day - whenever I get spam. The postmaster account at
sourceware.org gets a lot of spam and it often seems to be a heads up
for spam that will soon be flooding the mailing lists. So, if I can
catch spam that shows up there before it hits the mailing lists you
never see it.
Oh, and there's also the "aaaspam" honeypot as well as a bunch of other
email aliases at sourceware.org/gcc.gnu.org. Mail sent there
automatically causes the email address to be added to a black list. I
scan the black list hourly for accidental additions from mailing list
subscribers and remove any that show up.
That's it in a nutshell.
Any further questions about this should probably go to cygwin-talk.
I've set the cc there.
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