[imp] Horde/IMP and mail clusters

[Bubuk Gabrok]

I need some idea on how to accomplish this.

I have successfully setup two qmail-ldap servers with its native
qmail-ldap clustering support. Using the mailHost (ldap) attribute, I
am able to send mail to someone and that mail will be correctly
delivered to the correct host as specified in mailHost. So, half of my
users will have their mails in server-A and the other half in
server-B. Both mail servers have IMAP and running fine. All user
accounts are stored in server-A.

I have a third server (server-C) that I will use to run IMP (and some
web pages). How do I configure IMP so that it will know from which
server to get a particular mail from, for a particular user ? Can I do
this without any extra hardware?

I am no sysadmin, please go slowly. I appreciate all advises. Many thanks.

--
Bubuk