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 14 hours 51 minutes ago
• Moved by Jason Johnston [MSFT]Microsoft employee 14 hours 46 minutes ago Not a development question.