qmail+virtualdomain

[Massimiliano Santarelli]

HI! i've compiled qmail on mi server and it works well!
Now, i'm still trying to add a virtualdomain, 
modifying the  locals/rcpthost files ,
and in virtualdomain file (newvirtualdomain:newuser).
But if i try to send mail to newuser@hostname, the delivery happen! so the
account newuser@newvirtualdomain and newuser@hostname seems to be the same
thing for the user called "newuser"!!!!
How can i solve this problem and split different users with different
virtualdomain??

Massimiliano