I know technology can't solve all user incompetence but can't mailman just obfuscate mail addresses in quotes? I've been harping over this for a long time. Each time I tell people to configure their MUA not to quote my / anybody's email address but it'll be much easier if mailman can screen the messages for email addresses in quotes and remove / edit them out?
Are you trying to trying to reduce the amount of spam you get? What if I create a score of webpages each mentioning your email address a multiple number of times, with the proper mailto: tag, etc.. What will you do then? Would it not lead to spam too?
Regards, Debarshi