I have run into a problem with allowing outside users to email into an on prem. Distribution Group in a hybrid environment the following is the setting for allowing this on Exchange:
And Next is for office 365:
But when you have a hybrid environment the 365 option is set to "Only senders inside my organization" and when you try to change it:
What's interesting it seems the exchange setting and the 365 setting do not coincide whatsoever. Any suggestions?
Sean