Your company subscribes to the Office 365 Enterprise El plan. You are the Microsoft
Exchange Online administrator.
In the last week, employees have reported that they are receiving non-delivery report
messages from other companies. The employees have not sent messages to recipients
within those companies.
You need to prevent non-delivery report messages from reaching employees.
Which content filter option should you turn on in the Exchange admin center?
A.
NDR backscatter
B.
Conditional Sender ID filtering: hard fail
C.
SPF record: hard fail
D.
Block all bulk email messages