Is there any way to get some more detailed message stats from the system?

I would like to know what % of our mail have attachments over 1mb in and out, also how many Fwd's with and without attachements are in my mail store.

I seem to have an awful lot of fwd'd jokes and shit doing the rounds lately and want some facts to backup a memo I am going to issue on the subject.

Some of my users are seeing the same crap 3 or 4 times from trusted sources.