VPOPMAIL + IMP + DOMAINS

[Jose P. E. Junior]

Well people...

I just ended a fresh instalation of IMP/HORDE (imp 2.2.3, horde 1.2.3), now 
I'm thinking in some alterations, but I need some help:

I run a web hosting service, I want to put IMP as my webmail for people 
that have a domain with me, so, I'm thinking in something like this

example.com is the domain of my client.

webmail.example.com

redirects him to the imp page, he just need to put his login and password 
and voila!

But...

I use qmail/vpopmail, i can login in the pop server as client@example.com, 
then he'll get the mail for that user and that domain.

I need to discover a way to pass to imp these variables (via url, or a php 
page), like

login.php3?domain=example.com

and with a additional problem, i don't want to show a server list to my 
client, but it seens to be the oly way to get IMP working with pop servers!

Thanks for any help

--
Jose P. E. Junior - ICQ 1142954
Network Admin - Geo-rede Wireless Internet
http://www.geo-rede.com.br