Provide support for Failover Smart Hosts
Provide support in the connector routing interface to allow a priority to be assigned to Smart Hosts. This would allow for a failover situation between different providers. Similar to an MX record priority.
You can specify an MX record in the smart host field. This allows you to achieve the same functionality. For example, create MX records of “onprem.contoso.com” and point your connector to that as the smart host.