"The RPMs have all of the needed and commonly asked for
patches included so you can have a mail server up and running in
about an hour. When it's all complete, you'll have a full Qmail
mail server installation ready for just about anything. I
personally run Qmailtoaster servers for other companies and ISPs
who have tens of thousands of users on their systems.
"The Qmailtoaster project has been around for over 6 years and
has it's own wiki for user contributed information and tips, a
mailing list where users and other admins can offer support or
suggestions on how to fix just about any issue you may run across.
They even now have a "Video Magazine" that is a weekly video
produced to show you how to install, configure, tune, and
troubleshoot your Qmailtoaster system. An ISO is available that
will install CentOS and Qmailtoaster for you as well. On a VMWare
system a typical install (for me and my hardware) takes about 8
minutes with the ISO. Did we forget to mention that they have
VMWare images available for download as well?"