I decided to actually start reporting some of my spam. After a bit of research, the most promising antispam reporting unix tool I found was Ricochet. It's fairly nice, although a little overzealous.

It has an interactive mode for controlling who gets emailed - this totally failed to work on FreeBSD 6.1. It appeared to be doing some very dodgy things with getc in perl to read individual characters from a tty, without setting up the tty modes correctly. I did a hacked version of the main script that uses Term::ReadLine and seems to more or less work, although it's a bit ugly. I mailed the maintainers about it, but given that it was last updated in 2003 I don't expect much action.