MTA (message transfer agent)
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Microsoft Exchange 2000
The component in all versions of Exchange Server that transfers messages between servers using the X.400 protocol. [Exchange 2000]
Technology› E-mail› Microsoft Email› Microsoft Exchange
Microsoft Exchange 2003
An Exchange component that routes messages to other Exchange MTAs, information stores, connectors, and third-party gateways. Also referred to as X.400 protocol in Exchange System Manager. [Exchange 2003]
Technology› E-mail› Microsoft Email› Microsoft Exchange
Microsoft Exchange 5.5
An Exchange core component that routes messages to other Exchange MTAs, information stores, connectors, and third-party gateways. [Exchange 5.5]