many users

[Tom Allison]

I think I just figured out why spam filtering is such a pain in the neck.

I want to set up my new mail server to run spam filtering for more than 
one account (5 really, but let's pretend it's 500).

Setting up individual user accounts might not be practical.
I can easily enough add them all with /bin/false as their login shell 
and not have an issue with security.  But now I have a lot of files to 
manage.

This makes bogofilter for many users difficult to impliment.

It makes any spam filtering methodologies that I'm aware of difficult to 
impliment.

Any suggestions?