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Help in sharing the primary SMTP address between Exchange organizations

Posted on 2010-11-15
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Last Modified: 2012-05-10
HI,

I am trying to share the primary SMTP namespace between two separate Exchange organizations.  I have read http://support.microsoft.com/kb/321721 but still have a question.

From what I have been reading, this can be accomplished in one of two ways.  I can either create a new recipient policy and add the primary namespace and then check to have it non authoritative.  Or, I can enter the IP or name of the server that will handle mail under “Forward all mail with unresolved recipients to host” under Default SMTP Virtual Server.
I am trying to find if there is any benefit of using one over the other.

Thanks
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Question by:dross333
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Akhater earned 2000 total points
ID: 34136831
“Forward all mail with unresolved recipients to host” is an exchange 2003 in 2007 you need to use the "non-authoritative" approach
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Author Comment

by:dross333
ID: 34137068
Thanks Akhater.

I am trying to get this to work on 2003 to forward to my 2007 server.  So, would the “Forward all mail with unresolved recipients to host” be my best option?  And do I just enter the IP's of my 2 hub servers.
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LVL 49

Expert Comment

by:Akhater
ID: 34137096
yes since you are trying to do this on your 2003 then “Forward all mail with unresolved recipients to host” is your option
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Author Comment

by:dross333
ID: 34147199
I did this last night during our maintenance window, but it did not work.  I then used the other option of:
1. Removing primary authoritative SMTP domain from defaul recipient policy
2.   Creating a new recipient policy and adding the shared domain name and making it primary but non authoritative.

Everything seems to work, but I dont fell 100% confident.  My concern is that there is no authoritative domain for this SMTP address.  What problems can this cause?

Thanks

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Expert Comment

by:Akhater
ID: 34147333
When you say you removed authoritative you removed from the 2k7 side?

If so then the 2003 is authoritative
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Author Comment

by:dross333
ID: 34147412
No, I removed from both 2003 and 2007 side.  Neither is authoritative for the shared SMTP domain.

From the MS article, I took away that if one side is authoritative it will not pass through the SMTP connector. For example, if I am in the middle of migration and half of the users are on E2K3 and half are on E2K7.  if one users tries to send to user on the other exchange server, it will not use the SMTP connector to find the user because it will see itself as authoritative.   I'm sure I am missing something but not wure what.
I appreciate you helping me with this,.
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Author Comment

by:dross333
ID: 34148771
So, I made the Exchange 2007 authoritative and it seems to work.   I am able to send from each exchange server  to recipients on the other exchange server.  Also, when I had neither of the servers authoritative the messages to a non existant users would continue to bounce.  If I looked in the tracking, I would see multiple SEND/RECEIVE messages for the same message.  Once I made the change, I now only see the correct sequence of messages.

Thanks
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LVL 49

Expert Comment

by:Akhater
ID: 34149395
so i can take it that all is working for you now or you still need help in anything?
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Author Comment

by:dross333
ID: 34150595
All is good.  I appreciate you help.
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Author Closing Comment

by:dross333
ID: 34150605
Thanks Much
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LVL 49

Expert Comment

by:Akhater
ID: 34150620
thank you for the points :)
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