klist(pdf.php) - phpMan

dnsblog (8)          - Postfix DNS white/blacklist logger
ExtUtils::Packlist (3pm) - manage .packlist files
Mail::SpamAssassin::Plugin::DNSEval (3pm) - look up URLs against DNS blocklists
Mail::SpamAssassin::Plugin::URIDNSBL (3pm) - look up URLs against DNS blocklists