DPKG dependency

[axolx@speakeasy.net]

I am using sarge with qmail as my MTA. I compiled and installed qmail
rather than using the debian package. Now, every time I try to install
packages that depend on an MTA (say mutt) aptitude adds Exim to the list
to satisfy the dependency. How can I override this and tell package
management that I have qmail running just fine and to forget about Exim?

I know how to force the install of a given mutt ignoring dependencies,
but then, every time I would try use aptitude to install a new package,
it would automatically add Exim to satisfy the pending dependency. I'm
looking for a permanent solution. Any help would be appreciated.

thanks,
martin