tar.gz and dpkg/apt

[Deim Agoston]

Hello !

How can I tell the apt and/or dpkg that I have an MTA installed
(postfix20000531) but not from deb package (it was tar.gz). Now everytime
I install or remove something it tells me that the services which depends
on an MTA won't work. And another question. Where can I find docs about
building deb packs from tar.gz-s. (Not only from binaries but from sources
too)
Thanks,
Ago