Microsoft Exchange Server 2003 Administrators Companion (Pro-Administrators Companion)

A server that holds at least one database that front-end servers can connect to when relaying requests from clients.

A control that allows you to forbid messages or connections from a user, a group, a computer, an address, a domain name, or another construct.

See bridgehead server (BHS).

A server that acts as a message transfer point between Exchange routing groups. This term also refers to a computer that is hosting a directory replication connector.