Matts (email not shown publicly) I work for MessageLabs [messagelabs.com] in Toronto, ON, Canada. I write spam filters, MTA software, high performance network software, string matching algorithms, and other cool stuff mostly in Perl and C.
I just put Net::DCCIf on CPAN. It's an interface to the DCC's persistent daemon (dccifd). Might help someone writing a perl based anti-spam engine. Thanks to MessageLabs for letting me open source this.