Relay To Shared Domain
I want exchange to take messages from anonymous users on the internet, and either: A) Place that message in a local user's mailbox or B) if there is no local mailbox for that email relay that message on to an external email server Where the domain for either of those emails is the same. For example: A user sends a message to fred@mydomain.com. That messages reaches my Exchange server, but there is no mailbox for fred@mydomain.com so the message is relayed to externalsmtp.mydomain.com where Fred can go receive his email. How do I configure Exchange 2010 on SBS 2011 to perform such a task? I've already set up an accepted domain (as Internal, not Authoritative) and a send connector, but when I try to send a message to fred@mydomain.com, I get "550 5.1.1 User unknown" from the server
August 15th, 2011 11:03am

what version of exchange?
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August 15th, 2011 11:15am

Whoops, thought I'd included that. I'm using Exchange 2010 on SBS 2011.
August 15th, 2011 11:20am

Do you have an edge server?
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August 15th, 2011 11:24am

hi, 1) you are able to configure "internal Relay Domain" Start Exchange Management Console - Organization configuration - Hub Transport - Accepted Domains New Accepted Domain This is the setting if you administer a shared emaildomain between your Exchange server and an external mail provider. 2) you habe to configure a send connector for that domain. Or configure a send connector with the "*" Address Space Further information on how to configure shared domains: http://technet.microsoft.com/en-us/library/bb676395.aspx regards Thomas Paetzold visit my blog on: http://sus42.wordpress.com
August 15th, 2011 11:24am

Peddy: that's currently what (I think) I've got set up, and if I'm sending email as an exchange user it works fine, but once I'm an "Anonymous Internet User" whenever I try to send an email to an email address that doesn't have a mailbox, but is at my domain the server responds with a "550 5.1.1 User unknown"
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August 15th, 2011 11:30am

Looks like the recipient side is blocking anonymous connections. Work with the other Org to set the connection to allow anonymous users.
August 15th, 2011 11:40am

Is there some way to confirm without a doubt that this is the case? Because, if I sniff the connection between the server and the internet for SMTP, I only see the connection to my machine, and nothing to the external domain, leading me to believe that the send is failing at my server. Additionally, connecting directly to the external SMTP server anonymously seems to work fine.
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August 15th, 2011 11:49am

have you checked the mailheader from the NDR message? I´ve seen in some cases the Exchange system transforms the content so that it seems Exchange is the Server generating the NDR but if you look at the mailheader you can see an diffrent machine sending the NDR. regards Thomas Paetzold visit my blog on: http://sus42.wordpress.com
August 15th, 2011 11:56am

see http://blogs.technet.com/b/sbs/archive/2008/01/03/what-to-check-when-exchange-cannot-send-email-to-certain-domains.aspx
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August 15th, 2011 12:00pm

I believe I figured it out. I didn't have a mail contact for the user. Upon adding one, the problem seems to have been solved. This was the thread that clued me in: http://social.technet.microsoft.com/Forums/en-CA/exchange2010/thread/714adceb-a4fa-4f5d-ac7d-0de5d9ce9883 Edit: That was definitely it. I just had to follow the instructions here and then add a mail contact for each user that I wanted to be relayed.
August 15th, 2011 12:14pm

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