Enabling SquirrelMail For Your Web Sites On An ISPConfig 3 Server (Debian Lenny)

SquirrelMail's Apache configuration is in the file /etc/squirrelmail/apache.conf, but this file isn't loaded by Apache because it is not in the /etc/apache2/conf.d/ directory. Therefore we create a symlink called squirrelmail.conf in the /etc/apache2/conf.d/ directory that points to /etc/squirrelmail/apache.conf and reload Apache afterwards:

cd /etc/apache2/conf.d/
ln -s ../../squirrelmail/apache.conf squirrelmail.conf
/etc/init.d/apache2 reload

That's it already – /etc/apache2/conf.d/squirrelmail.conf defines an alias called /squirrelmail that points to SquirrelMail's installation directory /usr/share/squirrelmail.

Now go to the PHP open_basedir field on the Options tab of your web site in ISPConfig and add the directories /usr/share/squirrelmail and /etc/squirrelmail (that's the directory where SquirrelMail's configuration is stored) to the line, e.g. as follows: