Installing SquirrelMail on Debian 7

SquirrelMail is a webmail package written in PHP. It supports both SMTP and IMAP protocols. SquirrelMail features cross-platform compatibility since all of its pages render in HTML 4.0. SquirrelMail requires a web server with PHP to run properly. For this guide we’ll be using Apache 2.

1-Install Package

#apt-get update 
#apt-get upgrade
#apt-get install apache2 php5 php-pear mysql-server php5-mysql
#apt-get install squirrelmail

2-Configuring the Virtual Host

SquirrelMail provides a default configuration file for Apache in /etc/squirrelmail/apache.conf. Copy this configuration file into your sites-available folder with the command:
#cp /etc/squirrelmail/apache.conf /etc/apache2/sites-available/squirrelmail.conf
#vim /etc/apache2/sites-available/squirrelmail.conf
edit as match bellow:

#Alias /squirrelmail /usr/share/squirrelmail
Alias /webmail /usr/share/squirrelmail
<Directory /usr/share/squirrelmail>
  Options FollowSymLinks
  Order allow,deny
  allow from 10.105.0.0/16
  #deny from all
  AllowOverride None
  <IfModule mod_php5.c>
    php_flag register_globals off
  </IfModule>
  <IfModule mod_dir.c>
    DirectoryIndex index.php
  </IfModule>

  # access to configtest is limited by default to prevent information leak
  <Files configtest.php>
    order deny,allow
    deny from all
    allow from 127.0.0.1
  </Files>
</Directory>

# users will prefer a simple URL like http://webmail.example.com
<VirtualHost *:80>

  DocumentRoot /usr/share/squirrelmail
  ServerName mail.xm.shv

</VirtualHost>

# redirect to https when available (thanks omen@descolada.dartmouth.edu)
#
#  Note: There are multiple ways to do this, and which one is suitable for
#  your site's configuration depends. Consult the apache documentation if
#  you're unsure, as this example might not work everywhere.
#
#<IfModule mod_rewrite.c>
#  <IfModule mod_ssl.c>
#    <Location /squirrelmail>
#      RewriteEngine on
#      RewriteCond %{HTTPS} !^on$ [NC]
#      RewriteRule . https://%{HTTP_HOST}%{REQUEST_URI}  [L]
#    </Location>
#  </IfModule>
#</IfModule>

Save and exit.
#a2ensite squirrelmail.conf 
#service apache2 reloadYou should now be able to see SquirrelMail’s login page in your browser by: http://server-ip/webmail

3-Configuring SquirrelMail

Before using SquirrelMail for the first time, it needs to be configured to access your mail server. SquirrelMail provides a tool called squirrelmail-configure, which provides an interactive interface which edits the /etc/squirrelmail/config.php file for you with the input you provide.

Launch the squirrelmail-configure application with the command:
#squirrelmail-configure

This will bring up the menu shown.
There are many options to adjust here; too many for the scope of this guide. The only settings required to make SquirrelMail work are the Server Settings. Press 2 to bring up the Server Settings submenu:

adjust the Domain, IMAP, and SMTP settings to match the mail server you want to connect to.

When done, press S to save your changes before exiting the menu by pressing Q to quit.

after finish please check configure file /etc/squirrelmail/config.php
The interface layout follows standard email convention; all common functions should be easily accessible:

about addition of squirrelmail you can install plugin by download plugin and copy to directory /usr/share/squirrelmail/plugins

then run command:

#squirrelmail-configure
  select number 8 for install plugin.

Trouble Shooting

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Reference:
-https://www.linode.com/docs/email/clients/installing-squirrelmail-on-debian-7