feature request - multiple domains

[tdavis@birddog.com]

I know imp kinda supports multiple domains. What would be really cool is let's 
say you have three domains. 
ms.com 
ab.com 
ef.com 

Let's also say you made the appropriate dns records so they can access the 
jwebmail page as mail.domain.com 

Now, have imp know the referring URL such as mail.ms.com and put that domain as 
the only domain they can login to. 

The reason for this: 
IF you have a bunch of domains on a single box, any user can login to any 
domain because they are a valid user on that box and the auth mechanism doesn't 
know which domain they are supposed to be logging into. 

This can't be that hard hopefully. 

THank you! 
Terry 

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