[imp] adding default domain to addresses that don't expand?

[Liam Hoekenga]

> > how about having the option to add the default domain to addresses that
> > don't expand?  
> 
> Sounds fine as a preference; patch?

Ok, I've got this mostly working.  The one problem I'm having is what seems to 
by my perpetual problem - trying to accesses out of scope variables.

The code I've written is an addition tohorde/imp/expand.php, and I need access 
to $imp['maildomain'].   I can't access it there or with 
$GLOBALS['imp']['maildomain'] (I get an "undefined index: imp" error in my php 
logfile).  I can, however, query $conf['msg']['add_maildomain_to_unexpandable']
(from horde/imp/config/conf.php - I'm completely open to a shorter preference 
name, but I wanted something descriptive).

Do I need to do some sort of globals declaration, or include/require some file?

Liam