[Exim] Exim and MS Exchange

Does anyone have any information on the list ton using Exim with
Exchange, such that Exim just runs a number of server rules and such on
the emails (ie: anti spam stuff) and Exchange as the backend where mail
gets stored, users check mail, etc .

What I was thinking is just that exim accepts all mail (verify correct
user domain so not to appear like a relay), does all its rules and then
for delivery sends off to the Exchange Server for actual delivery to
user.


Thanks,

CH