Al Sparks writes:
1. If /var/qmail/users/assign exists, but a recipient address is not
in it, or covered by it with its wildcard mechanism, will qmail-local
use qmail-getpw?
Yes.
2. Given that there is an aliasing mechanism all in one file, with
qmail-users, why use fastforward?
Reading the man files, I see that qmail has 2 ways that it processes
mail locally (if Im wrong let me know). First is the qmail-getpw,
where the passwd file, and then the .qmail file located in a users
$HOME directory is used to determine where mail is delivered based on
the recipient address.