Postfix virtual?

[Sean McAvoy <sean.mcavoy@megawheels.com>]

Hello,
I have got fetchmail setup to download mail from a central server, and
deliver it to a local mail server (Postfix/Cyrus). the local mail server
is a different domain (DomainA.com) than the one fetchmail downloads
from (DomainB.com).
All users of DomainA.com have to use DomainB.com as their email address.
My problem is when a user on DomainA.com sends and e-mail to another
user that has an account on DomainA.com it is sent to the mail server
for DomainB.com, then fetchmail will eventually download it.
I would like to be able to have it so when postfix recieves an out going
message destined to user@DomainB.com it will actually send it to
user@DomainA.com.
I'm not quite sure which facility I can use in postfix to make this
happen. I would have a list of the specific users that this needs to be
done for, as there are many users at DomainB.com that do not have
accounts on the DomainA.com mail server.
Any help is a appreciated. Thanks



-Sean
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