Which Mail Flow Policy setting should be modified to accomplish this goal?

An engineer is configuring a Cisco ESA for the first time and needs to ensure that any email traffic coming from the internal SMTP servers is relayed out through the Cisco ESA and is tied to the Outgoing Mail Policies.

Which Mail Flow Policy setting should be modified to accomplish this goal?
A . Exception List
B . Connection Behavior
C . Bounce Detection Signing
D . Reverse Connection Verification

Answer: B

Explanation:

Reference: https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118136-qanda-esa-00.html