hi all

i have problem on postfix mail server.

i want to implement user restrictions on my domain


example scenario

user1@domain.com
user2@domain.com
user3@domain.com
user4@domain.com

are my email users in my server

i want to restrict user1 and user2
from sending and recieving to/from
its own domain w/c is @domain.com
and denied to elsewhere

while user3 and user4 and send & recieve freely
to/from the internet.

can you please give me a sample configuration
in main.cf whoever implemented this kind of
setup..

thanks
aris