Does virtualmin use postfix or sendmail? I'm trying to buy a book on it, but I'm not sure what it uses!

Thanks!

Hey Chris,

Virtualmin Professional uses Postfix in the default installation. Sendmail is also supported by the software, but isn't auto-configured for you during installation the way Postfix is.

We have a recommended reading section that includes some know-to-be good books on the relevant components of a Virtualmin system, including a pretty good Postfix book:

http://www.virtualmin.com/recommended-reading/