Configuring Internal Mail Hosts/Outbound Mail Proxy
Organizations with more complex email architectures may also require a more advanced internal mail hosts configuration. These organizations may have internal mail hosts between the Email Appliance and the internet. Settings for these outbound relays and the proxy are configured on the Routing: Internal Mail Hosts page.
If your organization routes all outgoing mail through a proxy server, you must also specify the hostname and port of that server on the Routing: Outbound Mail Proxy page.