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I have simple server Windows 2008 Standart SP2 with Exchange 2007 with apply SP1. Only one DC and one Exchange server (not exist Edge) in the same server.

I have first distribution group by name "[email protected]" with 10 users. Working with internal and external mail correctly.

I have second distribution group by name "[email protected]" with 3 users. Working with internal mail correctly, but external mail delivery failed 2 from 3 users. Only 1 users proclaims that external mail delivered correctly. Those 3 users they are too member of distribution group [email protected]" .

I am not found in the eventlog any problem with Exchange server. Any user and any distribution group not check the box "Require that all senders are authenticated."

Any ideas on how to solve the problem?


New informations for this case

Hi all,

i am have enabled delivered NDR report in hub transport. If you request a return receipt in Outlook, then will deliver the answer:

"Your message has been successfully relayed to the following recipients, but the requested delivery status notifications may not be generated by the destination. [email protected]"

I recently tried create new user with name [email protected] and adding member of distribution group with name [email protected]. I sent external mail to [email protected] and i discovered through "Outlook Web Acces" that delivery external email to the mailbox of [email protected] failed (email has not been found in any folders and antivrus not used). Thick mail client MS Outlok he has never been used for this user. I am verified by use with another user acount through MS Outlook, you see that [email protected] is member of distribution group with name [email protected]. Then i am adding new user [email protected] to distribution group with name [email protected] and i sending testing external e-mail, everything was alright (successfully relayed all members of distribution group [email protected]). Delete and re-create the distribution group with name [email protected] had no effect on the functioning of.

I recently tried create new distribution group with name [email protected] and adding to member same users as have distribution group with name [email protected], then i sending testing external e-mail to [email protected], everything was alright (successfully relayed all members of distribution group [email protected]).

I tried now delete distribution group with name [email protected] and next step functional distribution group with name [email protected] rename [email protected]. This action had no be effect on the functioning of. Only one from many users external mail has been delivered successfully. :(

Thank you for reply

best regards Alex

1 Answer 1

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  1. Create a new distribution group and add the 3 members of "[email protected]" to it.
  2. Test the new dist-group for proper mail delivery both internal and external.
  3. If the new group is working, delete the old (broken) group and change the display name and smtp address of the new group to whatever they were for the old group.

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