"This how to will help you to setup Squirrelmail on your
ISPConfig server. My how to is only a basic setup for Squirrelmail.
With this how to, you can run Squirrelmail in the webspace of your
choice and it will run on port 80. It is a nice alternative for the
Squirrelmail package which you can download at http://www.ispconfig
and which will run on port 81 after installing it.
"Squirrelmail comes with a lot of plugins, but I will not
mention these plugins in this how to..."