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tecpubFlag for United States of America

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Allowing External Messages to Exchange Distribution List

Hey Everyone -

Im trying to create a distribution list in Exchange 2010 in SBS 2011. Im using existing user accounts/mailboxes in AD, but need to accept emails from the outside. When I create the list, I check that in Mail Flow that "Authenticated Users" are not required. However, I'm getting a user not found error when sending email to the groups.

Note that I did create the group in Exchange 2010, not Active Directory. Not sure if that helps.
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Hendrik Wiese
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Hi,

As long as "Require that all senders are authenticated" is unchecked external mail should come in just fine. So the next thing to check would be the address book sync. Try to update your address book by doing the following and let me know if it helps:

Please refer to my article to achieve this: Manually Update Global Address List (GAL) on Exchange 2010
Don't know if you have an Edge server as well. If you do, run the following command from your CAS server:

Start-EdgeSynchronization -ForceFullSync

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Note the terminology differences between Active Directory and Exchange 2010. In Active Directory, a distribution group refers to any group that doesn't have a security context, whether it's mail-enabled or not. In Exchange 2010, all mail-enabled groups are referred to as distribution groups, whether they have a security context or not.

Please have a look at this MS article http://technet.microsoft.com/en-us/library/bb125178.aspx

Hope this helps!
Do you get mails on DL sent from internal users?
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HemantShinge
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Thanks!
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safeharbor

I have followed your instructions but have not been able to send email to external email addresses inside a distribution list. Any ideas?