[imp] User preferences in imp3

[Peter Beernink]

On our cobalt raq4 server, we have got a large amount of virtual domains. When 
we create an user account for such a domain, he is able to login on IMP, but 
when he doesn't change his default preferences, the From address will be the 
name of the first user in the mysql database and the email address of his 
username, but with our own domain name. Is it possible to have the from address 
set to his own domain by default. (We didn't have this problem with imp 2.2.4)

Greetings

Peter Beernink