The correct answers are Destination / Error Message for the routed mail , Email domain to be routed , and Mailer type that is utilized for the route . In Proofpoint route configuration, the essential elements of a mail route are the domain or host the route applies to, the mailer method used for handling the route, and the destination host or error behavior associated with that route. Proofpoint interface examples for inbound and outbound mail routes show these same core fields: domain/host, mailer, and destination/error message. These are the pieces that define how mail should be routed operationally.
The other options are not required route-definition elements. DKIM records and general email authentication data are important for overall mail security, but they are not the required fields used to create the outbound route itself. Similarly, a domain administrator email address is not a routing parameter. The route configuration needs to know what mail the rule applies to, how it should be sent, and where it should go. That maps directly to the three correct choices in this question. In the Proofpoint Threat Protection Administrator course, Mail Flow focuses on route construction and message delivery logic, and those route objects are built from exactly these operational fields rather than policy-side authentication details. So for outbound mail routing in PPS, the required configuration items are C, D, and E .
