How to set this configuration?

[Michail A.Baikov]

Hello to all, please help me, i'm don't know how to make following
configuration on my system, please consult me:

1. All UNDELIVERED mail for [EMAIL PROTECTED] route to [EMAIL PROTECTED]

2. User1 have e-mail box on domain2.ru ([EMAIL PROTECTED]), but not have
e-mail box in domain3.ru (both domain setup in one machine (and one qmail)).

May be use virtual domain? How? Write example plz.

3. How to set 2 and more domains with different lists of users?

I am use qmail and mysql patch.