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You can also write rules that match specific countries and add them to your /etc/mail/spamassassin/local.cf file. For example:

   header          RELAYCOUNTRY_BAD X-Relay-Countries =~ /CN/
   describe        RELAYCOUNTRY_BAD Relayed through China at some point
   score           RELAYCOUNTRY_BAD 3.0

   header          RELAYCOUNTRY_GOOD X-Relay-Countries =~ /^(FI|SE)/
   describe        RELAYCOUNTRY_GOOD First untrusted relay is Finland or Sweden :-)
   score           RELAYCOUNTRY_GOOD -0.2

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It's also possible to add a separate MIME header that shows all the message's relay countries, independent of the rules:

   add_header all Relay-Country _RELAYCOUNTRY_

This will show up in your MIME headers as:

   X-Spam-Relay-Country: US CN RU

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This module does not come with a database or update mechanism, but it is quite easy and fast to create yourself (it does need a bit of hacking, mentioned urls are outdated).

Easier way is to download a daily generated database, sponsored by HenrikKrohns:

Here you download occasionally updated files:

• httpshttp://mailfud.org/ip-country-dbfile/

The gunzipped file can be placed anywhere, just let SpamAssassin know where it is (country_db_path setting).

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The database consists of files named cc.gif and ip.gif. You can find the path with this command:

   $ perl -MIP::Country::Fast -e '$_=$INC{"IP/Country/Fast.pm"};s/\.pm/\n/;print';

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Here you download occasionally updated files sponsored by HenrikKrohns:

• httphttps://mailfud.org/ip-country-fast/