Usage of /var/qmail/users/assign

[Todd A. Jacobs]

I'm not 100% sure I understand the difference in intended usage between
setting up a ~/alias/.qmail-whatever file and setting up a virtual user in
/var/qmail/users/assign. As far as I can tell, the former uses forwarding,
whereas the latter is acting like a true alias.

Am I understanding this correctly? If so, what are the practical
implications? They seem almost interchangeable to me.

-- 
Todd A. Jacobs
Network Systems Engineer