Let's install a mailinglist manager. We chose Mailman because it's robust, scalable and easy to administrate. Mailman has a webinterface for list members, administrators and access to the list archives. The Mailman application is built on Python.

First install the software:
  apt-get install apache2 mailman

Create a default mailinglist:
  newlist mailman

Generate the necessary aliases for Postfix:
  /usr/lib/mailman/bin/genaliases
Copy the output of genaliases to /etc/aliases, run newaliases and reload the mailserver:
  newaliases
  /etc/init.d/postfix reload

Configure the webserver to facilitate the webinterface and list archives:

Create a file /etc/apache2/sites-available/mailman with this content:
<code xml>

ScriptAlias /mailman/ /usr/lib/cgi-bin/mailman/
<Directory /usr/lib/cgi-bin/mailman/>
   Options Indexes FollowSymLinks MultiViews
   AllowOverride None
   Order allow,deny
   allow from all
</Directory>

Alias /pipermail/ /var/lib/mailman/archives/public/
<Directory /var/lib/mailman/archives/public/>
   AddDefaultCharset Off
   Options Indexes FollowSymLinks MultiViews
   AllowOverride None
   Order allow,deny
   allow from all
</Directory>

</code>

Don't forget to enable the configuration changes:
  a2ensite mailman
  /etc/init.d/apache2 force-reload

Create a mailinglist manager site password:
  /usr/lib/mailman/bin/mmsitepass

Restart mailman:
  /etc/init.d/mailman restart

You should now be able to see the webinterface at http://yourhost/mailman/listinfo