set up email for domain which has already Virtual Server settings in Webmin

I have a case where i have the main domain pointing to nothing, and a sub directory with the data (drupal multisite).

The easiest way for me is to add domains with simply a server name and directory as a new virtual host in Webmin, apache server.

However, i dont get how i can add emails for that domain now?

I tried several things like alias, alias with email, etc. that might work but like i said the main domains points to the public_html but the actual content (and what i point the 'alias' domain to is in a sub-directory, and if i change it in the virtual hosts directives things go weird.

WHat could i do have simple a servername and directory directive, and also email? i guess set up dns manually to, or??

thanks for any tips here!!