Changes to the mailinglist setup

[Joshua D. Drake]

> Postfix is now used because Joerg knows Postfix, and Joerg is doing the work.
> Let's acknowledge that, and drop the unqualified Exim bashing, mmmkay?

Oh good lord. There wasn't any Exim bashing going on. They guy readily 
admitted that he didn't know Exim and that it seemed to make a 
difference when he changed setups. Likely Exim wasn't configured as well 
or thoroughly as the new Postfix installation.

However I am glad to see us move to a MTA that more than just Debian 
people will know ;)

Joshua D. Drake