Forwarding Exchange mail to multiple "outside" SMTP Servers

By rybasg ·
This is a bit involved, so please hang with me for a bit.

I have a customer who has an SBS server and is using exchange for their internal email (5 users), and for those 5 users to send out email. Each of them has a consistent user account and email address (domain xyz, email

They also have an "outside" email server hosted elsewhere. All incoming email for these 5 uses is directed there, and then the Exchange POP3 Connector picks it up and drops it in their Exchange boxes.

All of this works fine. Here is where the problem starts. In addition to the pop boxes on that "outside" server, they also have a number of forwarding groups (like "") which forward to a number of email addresses on different domains (hotmail, gmail, etc.) so that the volunteers get pertinent email.

This also works fine, as long as the sender is OUTSIDE the Exchange domain. If an inside user tries to send any email to one of these groups, they get a bounce from the exchange server with an error saying the addressee doesn't exist, since there is no Exchange box for "volunteers".

I would really like to continue administering these forwarding groups on the outside server, but I can't figure out how to get an email from an inside user to go to the outside server.

Anybody know how to get around this?

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