[horde] horde/imp returning to horde after login?

[Jason Parsons]

Hello.

I've just installed horde and IMP ALPHA versions.  I have just about 
everything working, but I'm confused by one thing.  I would like to 
login at http://www.example.com/horde/imp/, and be directed to IMP's 
mailbox.php after login.  What I'm getting right now is a redirect back 
to the Horde "portal".  It's not clear to me how to globally set the 
default page to be IMP.

Any suggestions?

Thank you.
  - Jason Parsons