[imp] Default Identity

[E.S. Rosenberg]

Hi all,
Hopefully this question has not been dealt with over and over again
and my search skills just failed.

At the moment I am in the middle of setting up a new imp 5 system that
is going to replace our fairly ancient IMP setup, one of the problems
I have run into is that the default Identity doesn't have a mail
domain part and therefor the user can't send mail until they actually
fix that.

Our users login with just their username (not user at domain).

I am sure that a solution exists and it may even be some setting that
I just keep missing when going through the settings pages but so far I
haven't been successful.

Thanks for a great program and your help,
Eli