get domoainname from URL

[Clemens Hermann]

Hi,

is there a way to get the domainname-part of a mailadresse from the URL of
the virtual server-name at the login page?
E.g. I have two Domains, dom1.com and dom2.com. I offer imp.dom1.com as
webmail URL for one and imp.dom2.com as webmail URL for the other domain.
Now the people would no longer need to enter the full mailadress but just
the part before the "@" because the rest could be gathered from the URL.
Does something like this yet exist? I did not find anything in the docs for
RC3 and google did not want to enlighten me either.

tia

/ch