User outside organization send email to 50 people in our organization and it creates an NDR The "e-mail system limits the number of recipients that can be
addressed in a single message. Send the message multiple times to fewer
If I bump the number to 50 it works fine.
What I need to prevent is someone selecting everyone in the GAL and sending a mass email which is why the 20 was set and certain individuals had higher numbers through AD.
Any way to prevent users from sending to more than 20 people (with exceptions) while allowing them to receive emails with more than 20 recipients?