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Exchange 2013 Server delivery model for non-exclusive domain

I am trying to figure out if there is a way to set up an Exchange server with the following criteria:

Background - our company is changing names and adding global partners.

Many addresses @domainA.com will be local users that connect to their existing mailboxes on the server.

Other addresses @domainA.com will be users who are running other mail services (not necessarily Exchange servers) located remotely in other parts of the world. These may be their own mail servers or a service provider like an ISP or Google Business Apps.

Internal and External email should be delivered to the local users where appropriate, but should be forwarded to the destination mail server for delivery for those users who are not members of the local domain.

Everyone should be able to send and receive from their @domainA.com address.

Is it possible to run this kind of set-up, and if so, what features or setup do I need to research?

Thank you in advance.

ASKER CERTIFIED SOLUTION

Simon Butler (Sembee)

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Christopher Beaugrand

ASKER

Thank you Simon. I had considered subdomains and may go that route if there is no other viable option.

Simon Butler (Sembee)

The other options are viable, but it will require a lot of work. Every new user created by any site would need to be created in the domain somewhere, either on Exchange or a hosted platform, so the emails are routed correctly.
Then you would have to ensure that every server being used is in the SPF records and the other providers are setup correct for your domain. You will in effect lose control of your domain.
One of the other sites does a mailing list with a dodgy return address - it comes back to your service and your reputation.

Simon.