This project was born when our
business got tired of the inadequacies
of Hotmail and AOL for business email.
I started looking around for a solution, and nobody had all the
features we needed in cost effective form. Given
a low budget (read zero) and demanding reliability requirements, I
turned to open source software. After looking
around I came to the realization that there is no such thing as an open
source “email server” as a complete package.
So even though all I knew about email was how to click the send button,
I set out to piece together a total system
from widely available programs. Here are my requirements in order:

1) Free (as in
beer, though speech is nice too)

2) Rock solid stability

3)
Paranoid security

4) Serious Anti-Spam measures

5)
Maintainability