[Mailman-Users] virtual domains not servername

[Newfield Nethost]

We have mailman on our server, and host several virtual domains. 
The admin page, users page, etc. for lists within virtual domains is 
listing our server instead of the virtual domain: 
http://ourserver.com/mailman/admin/list_virtualdomain.net 
But we would like it to be: http://virtualdomain.net/mailman/admin/list/ 
and http://virtualdomain.net/mailman/listinfo/list-users/  ..

What do we need to do to accomplish this?
Thank you.
tom 
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