Voraussetzungen: Apache 2.2 mit PHP 5.

• Paket einspielen:

# aptitude install squirrelmail squirrelmail-decode ingerman wngerman

• SquirrelMail-Konfigurationsprogramm aufrufen:

# /usr/sbin/squirrelmail-configure
2 (Server Settings)
A (IMAP Settings)
8 (Server software)
dovecot
R (Return to Main Menu)
3 (Folder Defaults)
3 (Trash Folder)
Trash
4 (Sent Folder)
Sent
5 (Drafts Folder)
Drafts
R (Return to Main Menu)
10 (Languages)
1 (Default Language)
de_DE
S (Save data)
Q (Quit)

• Basis-Pfad für URL auf webmail anstatt squirrelmail festlegen:

# vi /etc/squirrelmail/apache.conf
Alias /webmail /usr/share/squirrelmail

• Zugriff von außen erlauben:

# vi /etc/squirrelmail/apache.conf
[...]
<Directory /usr/share/squirrelmail>
  Order allow,deny
  Allow from all

• Zugriff per HTTPS erzwingen:

# vi /etc/squirrelmail/apache.conf
[...]
# 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 /webmail>
      RewriteEngine on
      RewriteCond %{HTTPS} !^on$ [NC]
      RewriteRule . https://%{HTTP_HOST}%{REQUEST_URI}  [L]
    </Location>
  </IfModule>
</IfModule>

• Apache-Konfigurationsschnippsel einbinden:

# ln -s /etc/squirrelmail/apache.conf /etc/apache2/conf.d/squirrelmail.conf

• Apache neu starten, SSL-Redirect testen usw.