Amanda, just out of curiosity, are you planning to implement exim4 as your MTA?
If not, if you plan to use something else, then purging exim4 from your system shouldn't be an issue.
But if you are going to use it, take a look here: PkgExim4 - Debian Wiki
And here: http://www.debian.org/releases/stabl...h08s05.html.en

