Add MX Record to a SBS2011 Server

This is a new one on me. I have a customer running a SBS 2011 server and uses Exchange Server. Now he has registered a second domain and wants all email for that domain to go to the same Exchange Server. What GoDaddy is saying is that I need to and a MX Record to that Exchange Server for the new domain. How do I do that?
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LockDown32OwnerAsked:
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Thomas WheelerCommented:
You need to add the mx to the dns zone and configure exchange to accept mail for the new domain
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LockDown32OwnerAuthor Commented:
Well.. a little more detail would be nice. I went in to the DNS zone for this second company and changed the MX record to mail.firstcompany.com

Then I got in to it with GoDaddy and they said 1) That the MX Records was probably correct (they don't support it) and 2) That the reason it wasn't working was because I had to add the MX Record to the SBS2011 Server

It was #2 that threw me. They seriously said I had to add the MX Record to the SBS 2011 server. Is that possible? What do I have to change on the SBS 2011 Server to get it to accept mail from this second domain?
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Thomas WheelerCommented:
Hope this link comes through. I am movle. So you could only add an mx record to sbs if you were hosting external dns there for the domain. Here is a link with steps to add an authorized domain and email policy.

http://blogs.technet.com/b/sbs/archive/2011/04/13/how-to-configure-sbs-2011-standard-to-accept-e-mail-for-multiple-authoritative-domains.aspx
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LockDown32OwnerAuthor Commented:
Thanks Thomas. Very helpful. I got a little lost on the email policy because they are going it a little different. There is no one really working for this second company. All the current users will really have two email addresses. One at company1.com and the second at company2.com

   So I couldn't really use the criteria "Company Name" in the email policy. I didn't use any criteria. I'll keep and eye on it and see if I got it right.
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Thomas WheelerCommented:
Nice
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LockDown32OwnerAuthor Commented:
Still having problems. It looks like everything is set up OK but none of the email from their second domain is arriving at the SBS 2011 Server. At least not that I can see. For debug purposes how can I tell if mail if from that second domain is actually making it as far as the sbs server?
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Thomas WheelerCommented:
When you send a message ate you getting a bounce back?
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LockDown32OwnerAuthor Commented:
Yes. This is weird. I used the Microsoft Remote Connectivity Analyzer and tested the inbound smtp server with an email address from the second domain. The message it sent actually showed up in her inbox. When I send one from my Outlook here at the office it seems to be adrift and I get bounced after about 12 hours. So it does work. I am thinking I need to give it a little longer to propagate the MX change throughout the internet. I'll keep playing. Thanks for all the help.
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