Mail flow and the transport pipeline
How messages flow through an organization and what happens to them has changed significantly in Exchange 2016. Following is a brief overview of the changes:
- Transport pipeline The transport pipeline in Exchange 2016 is now made up of several different services: the Front End Transport service, the Transport service, and the Mailbox Transport service. For more information, see Mail flow and the transport pipeline.
- Routing Mail routing in Exchange 2016 recognizes DAG boundaries as well as Active Directory site boundaries. Also, mail routing has been improved to queue messages more directly for internal recipients. For more information, see Mail routing.
- Connectors The default maximum message size for a Send connector or a Receive connector has increased from 10MB to 25MB. For more information, see Connector limits.You can configure Send connectors to route outbound mail through the Front End transport service on Mailbox servers. For more information, see Configure Send connectors to proxy outbound mail.
Administrators are permitted to use the EAC to generate or create a group naming policy now which lets you standardize and manage to control the names of distribution groups which are created by users in your enterprise. You can automatically by default append a prefix or suffix to the name of the distribution group while it’s being created, and you can restrict or block specific words from being used in group names.