[ Thanks to Falko
Timme for this link. ]
“The SquirrelMail package from the Debian/Ubuntu repositories
comes with a configuration file for Apache, but not for nginx. This
tutorial shows how you can use the Debian Squeeze/Ubuntu 11.04
SquirrelMail package in an nginx vhost. Nginx is a HTTP server that
uses much less resources than Apache and delivers pages a lot of
faster, especially static files. “