[imp] Virtual Hosts- How is this possible?

[Alan Hicks]

I'm wanting to setup IMP 3.0 on the Horde 2.0 framework (which is
already working) to accept virtual hostnames.  Basically, I would like
for someone to enter their e-mail address in the "name" field (which
would be renamed to "e-mail address") and have imp authenticate from
that.

Our current setup is small (compared to many organizations at least). 
We have around 200 mail accounts stretched among say.... 10 domain
names.  I checked the FAQ, and the only clue it gave me was to a file
that no longer exists in the latest release of IMP.  I've also searched
google and come up mostly empty-handed.

One problem we have, is that not all e-mail users have unique account
names.  Example:

root@darkstar~$cat /etc/mail/virtusertable |grep jane
jane@domainname1.com jane
jane@domainname2.com jane1

I not only need virtual domains setup in IMP, I need some way for
jane@domainname2.com to login without even knowing her username is
"jane1" and not "jane".  Any ideas?

P.S.  I'm a php rookie, so messing around with the actual scripts is a
nightmare for me, though a nightmare I'll endure.