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  Re: Passive Aggressive Spam Filtering (mod -7/31)
by Andreas Vögele (85.216.54.124) on Fri Jul 17 19:45:55 2009 (GMT)
  > 3. CIDR is very efficient (even if unfair as we do it for China or Korea).

We get much more spam from Brazil and the US than from China and Korea.

> BTW, I add to spamd.conf(5) some lists from my favorites top spam countries (which I'm not communicating with). Here is my script to get a good country ranking (install GeoIP package before): [...]

BTW, it's easy to add GeoIP lookups to the Exim mailer. I put the following code into /etc/exim/exim.pl.

use Geo::IP;
my $geoip = Geo::IP->new(GEOIP_STANDARD);

sub geoip_lookup_address {
  my $ip_address = shift;
  my $country_code = $geoip->country_code3_by_addr($ip_address);
  return $country_code;
}
This module is loaded with...
perl_startup = do '/etc/exim/exim.pl'
...and, for example, later used like this
  # Look up the country the sender host is located in.
  warn
    condition = ...
    add_header = X-Sender-Host-Country: ${perl{geoip_lookup_address}{$sender_host_address}}
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