bridgehead server

A nominated server that acts as a message transfer point between Exchange 2000 routing groups. This term can also refer to the computer hosting a directory replication connector. [Exchange 2000]

A computer that connects servers using the same communications protocols so information can be passed from one server to another. In Exchange Server 2003 and Exchange 2000 Server, a bridgehead server is a connection point from a routing group to another routing group, remote system, or other external system. [Exchange 2003]

In Active Directory replication, a single server in a site that is designated to perform site-to-site replication for a specific domain and transport. In a messaging system, a server that receives and forwards e-mail traffic at each end of a connection agreement, similar to the task a gateway performs.

An Exchange computer that acts as the endpoint of a connection between two sites and is responsible for routing messages through that connection. [Exchange 5.5]