Distribution List Not Getting External Emails - NDR 5.1.1

I have Exchange 2007 running with an edge transport server. I am recieving the following error when attempting to send to a newly created distribution list in Exchange 2007 from an external address (such as yahoo):  

faxes@anyorg.org>: host 10.1.1.238[host 10.1.1.238] said: 550 5.1.1 User
    unknown (in reply to RCPT TO command)

I can send to this distribution list internally with no problems. I have checked and verified that the "require that all senders are authenticated" checkbox is UNCHECKED.

The IP referenced in the error message refers to our Edge transport server. Anyone able to provide some insight?

Thanks
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NPDAdminAsked:
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gupnitConnect With a Mentor Commented:
Hi,
Lets look at it again !!!
  • Create another DG (new) with same Users and during creation unchecked the "Require that all senders are authenticated" checkbox.
  • Now force Edge Sync
  • Verify that the new DG got replicated.
  • And then send a mail from outside.
Do let me know
Thanks
Nitin
 
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gupnitCommented:
Hi,
Make sure that Edge Subcription is working fine and that the DG was syncd to Edge Server.
It may not be getting it in its list
Cheers
Nitin
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NPDAdminAuthor Commented:
I have verified the edge subscription is working properly. How can I check the DG was synced to Edge?
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gupnitCommented:
Hi
Run
Test-EdgeSynchronization -VerifyRecipient example@yourdomain.com
Here is Link to guide you more ::: http://technet.microsoft.com/en-us/library/bb266939(EXCHG.80).aspx
Thanks
Nitin
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NPDAdminAuthor Commented:
Ahh yes - I did run that as well. Looking at the output, Recipient Status does say Syncronized.

This is driving me nuts.
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gupnitCommented:
Follow this http://forums.msexchange.org/m_1800473954/mpage_1/key_/tm.htm#1800473954
and force subscription again !
Thanks
Nitin
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NPDAdminAuthor Commented:
I appreciate the link however in my original post I mentioned I already unchecked the "Require that all senders are authenticated" checkbox. I have also already tried forcing a resync as noted above, and also tried recreating the edge subscription. Is there something I am missing here?
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gupnitCommented:
Opps....I agree I overlooked...!! http://support.microsoft.com/kb/930463/ 
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NPDAdminAuthor Commented:
I do not believe the above MS KB article will apply to my current situation. Number 1, I have Exchange 2007 SP1 installed - this article references update rollup 4 - released prior to SP1. Secondly, the article references a cause for recipients who are located in domains other than the Hub Transport server or outside the root domain tree. The distribution list I am sending to is in the same domain as the Hub Transport server.

Any other ideas?
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NPDAdminAuthor Commented:
I have followed the above procedure several times during the last few days with no luck. However, this morning I created a new distribution group (again) with the same name as previously, only all lowercase. After removing the check from the "Require that all senders are authenticated" checkbox, I was able to send to this distribution list from an external address. This leads me to believe that sending to a distribution list is case sensitive, which I didn't think was the case. Regardless, thank you for the assistance in narrowing down a solution.
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gupnitCommented:
Hi,
I have never come across Case Sensitve Issue.
To be honest - I was thinking that you are making some mistake in the process, hence didnt know what to recommendd
Cheers
 Nitin
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phantomhCommented:
Hi, I have just come across the exact same thing, the distribution group's email address is case sensitive, if it is all lower case it will except any case but when you specify the case it will only except that case - this is very dumb!!!!
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