File mailman-apache2.conf of Package mailman
# the <IfDefine MAILMAN> block means that the contained configuration is not
# active unless apache is started with '-D MAILMAN'. This server flag
# is passed at start time if it is set in /etc/sysconfig/apache2 -- which can
# be set by running the command 'a2enflag MAILMAN'.
<IfDefine MAILMAN>
ScriptAlias     /mailman/       /usr/lib/mailman/cgi-bin/
Alias           /mailmanicons/  /usr/lib/mailman/icons/
Alias           /pipermail/     /var/lib/mailman/archives/public/
<Directory /usr/lib/mailman/cgi-bin>
        <IfModule !mod_access_compat.c>
                require all granted
        </IfModule>
        <IfModule mod_access_compat.c>
                order allow,deny
                allow from all
        </IfModule>
</Directory>
<Directory /usr/lib/mailman/icons>
        <IfModule !mod_access_compat.c>
                require all granted
        </IfModule>
        <IfModule mod_access_compat.c>
                order allow,deny
                allow from all
        </IfModule>
</Directory>
<Directory /var/lib/mailman/archives/>
        Options +FollowSymLinks
        <IfModule !mod_access_compat.c>
                require all granted
        </IfModule>
        <IfModule mod_access_compat.c>
                order allow,deny
                allow from all       
        </IfModule>
</Directory>
</IfDefine>