List user's email behaviour. Best approach?

[Jeff_Newton]

What I would like to do is be able to get an idea of a user's email
history; who they mailed, received mail from, what was the subject, and
what was the size (or if there was an attachment).  This information
would be useful in determining if there any potential loses of
intellectual property via email.

Has anyone tried to do this?  Can anyone suggest a good approach to
take?

Cheers,

-- 
Jeff Newton
Security Analyst