SORBL is antispam tool to auto-learn own dnsbl zone. Written on Perl.
Currently using: sendmail (I have no other MTA's logs now;)), rbldnsd, host (bind-tools). Also required any (bayesian) filter (I use spamassassin) in milter mode.
SORBL look for sendmail (sm-mta) messages about relay and about adding "X-Spam-Status: Yes" header, analyse IP/hostname/rDNS info, based on plugins and keep blocked ip list in file for rbldnsd daemon.
nordns - filter senders without rDNS;
iphost - ip-based names like: 126.96.36.199.in-addr.arpa. IN PTR 99-88-77-66.dsl.cool-isp.com.
Unlike standard "no-rDNS hack", for example, this way more liberal - IP will blocked only after first spam message. Also may be used spamassassin dnsbl feature - to help bayes auto-learning.
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