We would like to implement a hybrid deployment with a shared namespace and centralized mail control. However, our on premise exchange is not authorative for all address under the primary SMTP domain.
Essentially before the configuration of the hybrid model, the domain is configured as an internal relay domain in our on premise exchange, and hence any messages with recipients unknown to exchange are forwarded to a smarthost.
Essentially we need mail to come into exchange, delivery be attempted both on-premise or to cloud mailboxes and any remaining messages to be forwarded to out smarthost to either deliver or generate NDRs.
Is there a supported configuration for this requirement?
Many Thanks in advance
