Emailing internal Office 365 Groups from external sources

This is how to turn on the ability to email an internal Office 365 group from external sources.

Log into your Office 365 portal and go to ADMIN –> Exchange

Then go to groups under recipients

Select your group and click edit

Under delivery management select the radio box for Senders inside and outside of my organization & click Save

There is also a quick edit feature to turn this on via the right panel when you have selected the group