Hey,
Here something that seems to work that only requires a couple of minor mods to the default Virtualhost in the httpd.conf file.
In the main httpd.conf file where the default Virtualhost is defined, looks similar to this:
<VirtualHost your_server_IP_here:80>
ServerAdmin
[email protected]
DocumentRoot /var/www/html
ServerName localhost
ScriptAlias /cgi-bin/ /var/www/cgi-bin/
</VirtualHost>
Change it to this:
<VirtualHost 216.146.28.236:80>
ServerAdmin
[email protected]
DocumentRoot /var/www/html/squirrelmail
ServerName localhost
ServerAlias webmail.*
ScriptAlias /cgi-bin/ /var/www/cgi-bin/
</VirtualHost>
Basically, you are changing the DocumentRoot to point to squirrelmail and then adding a ServerAlias.
I don't know if it breaks anything with DA but, it seems to work OK.
Also, don't forget to make a DNS entry for each domain you want to point to webmail.domain.com.
You should be able to change the /squirrelmail to /webmail and to use UebiMiau.
As always, backup your httpd.conf before changing anything.
David
BTW, not sure how this acts on domains not on the main server IP. Didn't try that...