some ideas -
adaptive junk filters - i use them in thunderbird and i've never had a false-flagging on junk.
ISP call in's - if you can track a spammer to their true IP address, sending complaints may be an effective way of hindering their operations. I do this with new junk mail that gets past my filters - if the ISP found in the header is AT&T or another large firm than i know my complaint might be listened to, since they have a strict no-spam policy and dedicated addresses for complaints
hire bounty hunters - $1500-3000 per dismembered spammer's hand
adaptive junk filters - i use them in thunderbird and i've never had a false-flagging on junk.
ISP call in's - if you can track a spammer to their true IP address, sending complaints may be an effective way of hindering their operations. I do this with new junk mail that gets past my filters - if the ISP found in the header is AT&T or another large firm than i know my complaint might be listened to, since they have a strict no-spam policy and dedicated addresses for complaints
hire bounty hunters - $1500-3000 per dismembered spammer's hand