Regional SPAM Blocking in Postfix

[Mailing List]

> smtpd_client_restrictions =
>     cidr:/etc/postfix/personal_cidr,
>     cidr:/etc/postfix/regional_cidr,
>     reject_rbl_client zen.spamhaus.org,
>     reject_rbl_client bl.spamcop.net,
>     reject_rbl_client dnsbl.njabl.org

I found a great site with easy to download CIDR lists for specific 
countries:

http://www.countryipblocks.net/

For instance, to curl/wget the CIDR IP block list for Nigeria, you can 
use the URL http://www.remotetm.net/e_country_data/NG_cidr.txt

They update their IP databases daily (according to their website).

I'm going to make a simple cron script to pull down my selected list of 
countries and generate iptables rules from them. I prefer to just 
blackhole such annoyances vs. bounce them.

--Adam