Multiple Domain

[rusmana]

Can somebody help me, We have multiple (virtual) domain in the same machine. 
How to login to Sqwebmail with multiple domain without type domain (just 
abcd without @domain.com).
Like Hotmail or MSN, user just type user id and chose domain hotmail or MSN. 

We use qmail and vpopmail for virtual domain. 

Thanks 


Rusmana