Explanation:
Box 1: Yes
User2 is member of Dist1.
Dist1 is a distribution group with the primary email address [email protected].
Rule2 applies if the sender is [email protected].
Rule2 applies Office 365 Message encryption and rights protection.
Box 2: Yes
With the same logic as for Box 1 above.
Box 3: No
User1 is a member of Group1.
Group1 is a Microsoft group with the primary email address [email protected] User3 is the receiver and is not a member of any group.
The rules Rule1 and Rule2 do not apply.