NEWBIE: SBS 2003 shared by 2 companies

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Greetings-

I have been tasked with modifying the setup an SBS 2003 SP1 server for my
employer. There are a few administrative assistants that need to send and
receive email for two domains via the Exchange server.

Basically, domainA.com is the primary domain used for the install and has
been working very well for some time.

Domainb.com is a second (non-profit) company that shares some of the same
employees as domainA.com and offers free legal advise to disadvantaged
people.

All inbound email for both domains is run through MXLogic.com for spam and
virus filtering. The users that need to receive email for both domains have
the appropriate email addresses added to their exchange mailbox config. and
the MX records are set correctly so users receive email.

What I have not been able to figure out is how to set the ability for a user
to select the "from" address when they send an email and choose from which
domain the email seems to originate from - the only thing I can set is the
default address within the users account in ADUC. When I set the default
email address in ADUC to domainA.com, the user can only send email which
appears to be from that domain - If I change the default to domainB.com, the
user can send email and it appears to originate from domainB.com

Currently, the assistants only have a single mailbox, and that mailbox has
several email addresses, but only a single "default" address.

Does anyone know how to configure a default install of SBS and Outlook so a
user can choose which domain the email originates from? Please be as
descriptive as possible, as I am very new to SBS. I think I need to add a
second virtual server, but can't seem to figure it out. I am also concerned
that the email may be flagged as spam because of the masquerade.

Thank you in advance!


.

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