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Phred (5358)

Phred
  fredNO@SPAMtaperfriendlymusic.org
http://www.redhotpenguin.com/

Fred is a Perl and PostgreSQL geek. He has made some very small contributions to a few cpan modules and mod_perl.

Journal of Phred (5358)

Friday September 23, 2005
12:22 PM

Spammers: 1, Phred: 2

[ #26860 ]

I host my own mail, and mail for several of my friends, as well as some small clients. Lots of these people like to put their email addresses up o the web unprotected (like me). I've been using Qpsmtpd to manage smtp services, and along with Spamassassin it has been doing an excellent job of keeping the spam volume down. I initially gave myself a point for that.

However over the past couple of months the volume has steadily been increasing and getting to the point where Spamassassin wasn't stopping everything, and I would get at least a dozen spams a day. So I gave up a point to the spammers.

Now Qpsmtpd has a greylist plugin written by Gavin Carr, but I haven't been able to implement it because I have users who can't deal with the fact that this would mean their mail would be delayed by at least 300 seconds. I, however, can't deal with the spam. So I needed domain specific greylisting. This is where perl comes in.

In less than 30 minutes, I was able to add domain specific greylists functionality to the existing greylist plugin. My config/plugins directory now contains the line:

denysoft_greylist domains redhotpenguin.com|taperfriendlymusic.org

And in the greylist plugin:

my $domains = $config->{domains};
my $host = $rcpt->host;
unless ( $host =~ m/$domains/ ) {
  return DECLINED;
}
# continue with greylist plugin

Simple eh? This has cut the existing spam volume down by 90% at least, while allowing my other hosted domains to receive mail normally. One point for me, thanks to Perl.

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  • Hi There, I was looking for this (your greylist domain trick) but it seems that this doesn't work over here.. I am not a perl programmer! Eval Global symbol "$config" requires explicit package name at ./plugins/greylisting Do you know what is happening !