mail-filtering on kerberos pop servers

After this spams I am thinking in setting up a filter machine that runs
cotinuously to clean up my mail from the pop server before I download!

The pop server use kerberos IV authentication. Where can I find a mailfilter
(or a mail transpont agent that has a built in filtering like kmal) that
can:
1- deal with kerberos IV authentication (KPOP protocol).
2- can download headers ONLY and delete which ever matches my spam criteria?


--
M Sager