Today I found out that NAI (Network Associates - makers of McAffee anti-virus and various other things) have just bought out DeerSoft - owners of the trademark "SpamAssassin" and employers of Justin Mason and Craig Hughes - the creator of SpamAssassin and another one of the developers respectively.
Unfortunately for me this creates a conflict of interest. NAI, a competitor of ours is now using code I created, and will continue to do so.
Looks like my development on SpamAssassin ends here. Shame.