Set 'webmail' subdomain for all virtual domains

Linux and Unix-Like Red Hat
1

I'm trying to set 'webmail.' as a subdomain for all virtual domains on the server.

The webmail domain will host roundcube, which is currently installed and accessible on '/roundcube'.

I'm using CentOS6.3 and Apache web server 2.2.15

The following is my httpd.conf for RoundCube.

It was like this...

Alias /roundcube /usr/share/roundcubemail

<Directory /usr/share/roundcubemail/>
         Order Deny,Allow
         Deny from all
         Allow from All
 </Directory>

and now it's like this...

<VirtualHost *:80>
        ServerName webmail.{HTTP_HOST}
        ServerAlias webmail.{HTTP_HOST}
        DocumentRoot /usr/share/roundcubemail

        CustomLog /var/log/httpd/sites/roundcube.{HTTP_HOST}.bytes bytes
        CustomLog /var/log/httpd/sites/roundcube.{HTTP_HOST}.log combined
        ErrorLog /var/log/httpd/sites/roundcube.{HTTP_HOST}.error.log

        <Directory /usr/share/roundcubemail>
                Options +Includes -Indexes
        </Directory>
</VirtualHost>

which doesn't work!

I restarted httpd after making the change, but I'm getting "Server not found".

Thanks in advance.

Peter