SquirrelMail in Debian
SquirrelMail is a GPL Webmail project, with aims to be complete but not have high requirements on server or client (browser). See http://www.squirrelmail.org.
This page contains some notes about SquirrelMail specific to the Debian packaging.
The following versions are available:
jessie (debian 8): this was the last version of SquirrelMail released with Debian; it may be some bug fixes behind upstream, but it works and is fully security supported. Get it by running apt-get install squirrelmail on your stable system. more info
backports.org: at the unofficial Backports repository, we're packaging the latest SquirrelMail upstream stable release, but packaged specifically for stable. See their website for information on how to acquire it.
The translations are packaged separately in the 'squirrelmail-locales' package. Install it if your users want their interfaces in something other than English. more info
You need to have the locales you want to use configured on your Debian system. The easiest way is to run dpkg-reconfigure locales and select those languages you want to provide (currently, stable SquirrelMail does not work with '@euro' suffixes). It's sometimes necessary to reload Apache to see the changes.
Are your clients using exotic character sets, e.g. from east-Asia? Install the 'squirrelmail-decode' package for extra character set support (Etch and up). more info
Upstream provides documentation on their website, including FAQ's, performance and security tuning. Happy SquirrelMailing!
http://www.squirrelmail.org/ - SquirrelMail project website