Forum Discussion
Distribution Group with External Members
We are seeing what I believe is strange behavior from a distribution group in 365 (this is NOT an Office 365 group). I created a distribution group with 2 internal members and 1 external member. ...
To follow up on VasilMichev it is an issue with the mail appliance. One of the scenarios I always used to come across was that the mail appliance was set not to accept mail inbound from org domain as this is typical of spoofing. This may be the case here.
Best, Chris
Best, Chris