A FortiMail administrator is investigating a sudden increase in DSNs being delivered to the protected domain for undeliverable email messages. After searching the logs, the administrator identifies that the DSNs were not generated as a result of any outbound email sent from the protected domain.
Which FortiMail antispam technique can the administrator use to prevent this scenario?

Refer to the exhibit.

An administrator has enabled the sender reputation feature in the Example_Session profile on FML-1. After a few hours, the deferred queue on the mail server starts filling up with undeliverable email. What two changes must the administrator make to fix this issue? (Choose two.)

Examine the FortiMail antivirus action profile shown in the exhibit; then answer the question below.

What is the expected outcome if FortiMail applies this action profile to an email? (Choose two.)

Examine the FortiMail user webmail interface shown in the exhibit; then answer the question below.

Which one of the following statements is true regarding this server mode FortiMail's configuration?