Relay is the connection behavior that must be selected to properly process the messages. Relay allows Cisco ESA to accept messages from the specified source and deliver them to the intended destination, without applying any content or reputation filters.
To configure a mail flow policy with relay connection behavior on Cisco ESA, the administrator can follow these steps:
Select Mail Policies > Mail Flow Policies and click Add Policy.
Enter a name and description for the mail flow policy, such as Exchange Outbound.
Under Connection Behavior, select Relay.
Click Submit.
The other options are not valid connection behaviors to properly process the messages, because they either reject, delay, or accept the messages with content or reputation filters applied.