We'll use those pieces of software as a very important part of this installation, that's why we'll make a special part for them.

Vpopmail is a virtual domain administrator, so that we don't have to use system users. We'll use the latest stable version which is 5.4.3, I wanted to use 5.5.0 but it's not compatible with qmailadmin which we'll use later.

Qsmtp is an enhanced version of the smtp program included with qmail (qmail-smtpd) and it also includes Qremote, which replaces qmail's qmail-remote. It's written by Rolf Eike Beer.

I am currently skipping VPOPMAIL+MySQL and using only cdb authentication.