Why did the Cisco Email Security gateway fail to do a spam scan on emails for [email protected]?

Refer to the exhibit.

The system administrator of mydomain.com was informed that one of the users in his environment
received spam from an Internet sender. Message tracking shows that the emails for this user were

not scanned by antispam. Why did the Cisco Email Security gateway fail to do a spam scan on emails
for [email protected]?

A.
The remote MTA activated the SUSPECTLIST sender group.

B.
The Cisco Email Security gateway created duplicates of the message.

C.
The user [email protected] matched an inbound rule with antispam disabled.

D.
The user [email protected] matched an inbound rule with antispam disabled.