Released a version of ClamMailFilter last night, it's still not completely finished, but it does the job (for me at any rate). It does appear to sometimes not clean up after itself which I'm currently working on, and should be fixed in the coming week or so.
Currently still working on the spam management system for work, will probably do a complete rewrite in python when that's working, and publish that version instead (current version is php4, which although it works, isn't the most pretty code in the world to work with).
Anyways - back to writing the subscription front end for the spam management so that our customers can sign up at the beginning of next month (nothing like tight deadlines, is there ;). I think that it'll be a mostly manual setup for now, but that shouldn't be too bad.