[imp] Users who's e-mail addresses are different from their login names

[Jeffrey Steinbrecher]

Hi i'm currently using horde 3.0.4 and IMP 4.0.3 with an exchange 5.5 
imap server

I have some users who don't log in with the same name as their e-mail 
address. How do i tell IMP to use a different reply address with these 
special case users.

also, i have no options tab - how do i add this in for my users?

thank you,

-Jeffrey Steinbrecher