I second the idea of using postfix or generalizing things such that any MTA can be used. Qmail is OK, but my testing has shown postfix to be a bit faster AND easier to set up.
Besides, you can ask real questions on the postfix lists without getting an obnoxious answer from Dan. Dan's crappy attitude is one of the main reasons I've stopped using qmail and his other tools. If you can't get a straight answer from the developer without insults and condescention, I consider it unsupported software.
Cheers,
C
