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SBS 2008 Multiple Email Domains SEND and RECEIVE

Hello, We are looking at two separate companies that have merged, Both have their own SBS 2008 server and associated environment and are looking to merge the IT infrastructure. The intention is to remain as separate entities but share the same IT platform/premises. They would like each set of employees to have access to the other companies shared data on the network as well as running two domains for email. The email aspect is key, They need to be able to both Receive email through the same gateway for both domains but also be able to send email from both domains. At present we have two SBS 2008 boxes, We know one needs to go, The email is the major issue, How do we set it up that we can have a proper two domain email setup and prove reliable? Users sending email may need to be able to select the primary domain which would be the company that they originally belonged to in order to maintain the separation in question. If it can't be done any alternative suggestions?
2 Solutions
David AtkinIT ProfessionalCommented:

You are correct by saying that one server needs to go.

I did something similar a few years ago (In this scenario company1 will be moving into company2's building.  Everything will run off Company2's Server):

1) If possible change Company1's incoming mail to POP. This will allow you to receive mail whilst moving etc.

2) Move Company1's Server into the same building as Company2, disable DHCP.

3) Pick the server with the best spec, reliability etc - For me it was Company2's server.

4) Add new accepted domains for company1 on Company2's Server.
See here: http://technet.microsoft.com/en-us/library/aa996910(v=exchg.80).aspx

5) Change the recipent address policy to give all users another email address on the additional domain.
See here:http://blogs.technet.com/b/exchange/archive/2006/11/16/3397300.aspx

6) Create new users for the staff at Company1 on Company2's Server

9) Move/Copy shared folders Onto Company2's Server as required (I used robocopy for the logging)

8) Disjoin Company2's PCs from the Company2 Domain and add them onto Company1

9) Export mail from the old server using either Outlook or directly from Exchange.
See here: http://blogs.technet.com/b/exchange/archive/2007/04/13/3401913.aspx

10) Change mail delivery for Company1 to an MX record pointing to the same IP as company2.

11) Change External DNS Records for Company1's Internet name etc (Remote. / Mail. etc)

12) Use the other server as a file server?

I hope that helps a little
Rob WilliamsCommented:
Hosting multiple e-mail domains is fairly straight forward, Sean Daniel probably has the best post on doing so:

If all users send and receive using only their respective domain, by setting the users default e-mail address in the Exchange Management Console under mailboxes, the above will work seamlessly

However if users need to be able to send using an address from both domains it is a little more complex. Receiving is still no problem.  The method we have often used for sending from the alternate (non-default) domain is to set up a dummy POP account as outlined in the following video by keiran_b.

Another option often suggested in this forum is a 3rd party solution:

Alternatively you can set up multiple mailboxes for the different e-mail addresses/domains and grant the user send as permissions to each as outlined by ronnypot:
See also:

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