Issue: We are running Outlook 2007, with Exchange 2013. We have non-universal local distributed group (LDG). If our insider users sent email to outsiders, and included this non-universal LDG as one of the recipients, the non-universal LDG would be sent out as is. 

Problem: Outsider responded/replied email to "All", and got rejected alert off non-universal LDG.

Question: how to set up, either Outlook or Exchange, to resolve/expand these non-universal LDG into individuals to outsiders.

• Edited by Exchange 2013 User Thursday, April 02, 2015 4:32 PM
• Moved by Jason Johnston [MSFT]Microsoft employee Thursday, April 02, 2015 4:37 PM Not a development question.

Hi,

According to your description, my understanding is that you want the outsider could send email to this non-universal LDG, right?

You can use EAC/EMS to manage this non-universal LDG:

From EAC:

Recipient Configuration -> Groups -> Select a group -> Properties -> Delivery management -> Select "Senders inside and outside of my organization"

From EMS:

Set-DistributionGroup -Identity "LDG" -RequireSenderAuthenticationEnabled $false

In addition, Mail-enabled non-universal groups were discontinued in Exchange Server 2007 and can exist only if they were migrated from Exchange 2003 or earlier versions of Exchange. You can't use Exchange Server 2013 to create non-universal distribution groups.

Best regards,