That will provide ESA with the answer for the MX,A query. To answer you directly, then, it will depend on the DNS algorithm (round robin). If there is a SMTP route, though, that will take precedence. If none MX record is found, then ESA will try the A record. Each Virtual Gateway address is given a distinct IP address, hostname and domain, and email delivery queue.įor more information, see “Using Virtual GatewayTM Technology” in the “Configuring Routing and Delivery Features” chapter.Ĭisco ESA (Email Security Appliance, former Cisco IronPort Email Security Appliance) will use the DNS resolution of the MX records in order to try delivering the messages. The Virtual Gateway technology enables users to separate the appliance into multiple Virtual Gateway addresses from which to send and receive email.
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