Question about multi servers

[Kris von Mach]

I was wondering if anyone has attempted to create multi server installation 
of IMP, running Qmail+Vpopmail+Mysql+Courier-imap or something similar.

I would like to setup something similar to what is explained in 
http://www.horde.org/papers/Scalable_webmail_HOWTO.php except that I am not 
running LDAP.

My goal is to go to one url, www.mycompany.com from where virtual users, 
with virtual domain names, can get their email. For example, 
joe@domain1.com would live on server1, joe@domain2.com would live on 
server2. The idea is that all of this would be transparent to the users. 
And regardless on what server their domain/user lives on, they can get 
their email from the same one location, www.mycompany.com. I would also 
expect to have around 200 domains per server.

The only way I could think of making this work across multiple servers is 
if every user goes to for example mail.domain1.com to receive email for 
domain1.com, and mail.domain2.com to receive mail for domain2.com Or to 
have a drop down menu with 20 different imap servers... I know that imp has 
a preference option that would remember what imap server the user picked, 
but that wouldn't be "transparent", and would mean extra work for the 
end-users.

Any pointers, tips, examples, would be greatly appreciated :)

Thanks!

__
Kris.