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For recipients hosted locally, the final delivery of email to a recipient mailbox is the task of a message delivery agent (MDA). For this purpose the MTA transfers the message to the message handling service component of the message delivery agent (MDA). Upon final delivery, the Return-Path field is added to the envelope to record the return path.
The Simple Mail Transfer Protocol ( SMTP) is an Internet standard communication protocol for electronic mail transmission. Mail servers and other message transfer agents use SMTP to send and receive mail messages. User-level email clients typically use SMTP only for sending messages to a mail server for relaying, and typically submit outgoing ...
Email agent (infrastructure) An e-mail agent is a program that is part of the e-mail infrastructure, from composition by sender, to transfer across the network, to viewing by recipient. The best-known are message user agents (MUAs, aka, e-mail clients) and message transfer agents (MTAs, programs that transfer e-mail between clients), but finer ...
The comparison of mail servers covers mail transfer agents (MTAs), mail delivery agents, and other computer software that provide e-mail services. Unix -based mail servers are built using a number of components because a Unix-style environment is, by default, a toolbox [1] operating system. A stock Unix-like server already has internal mail ...
Exchange Web Services (EWS), an alternative to the MAPI protocol, is a documented SOAP -based protocol introduced with Exchange Server 2007. Exchange Web Services is used by the latest version of Microsoft Entourage for Mac and Microsoft Outlook for Mac - since the release of Mac OS X Snow Leopard Mac computers running OS X include some support ...
"MAPI protocol" is a colloquial name for the MAPI/RPC. At times, Microsoft has also called it "Exchange RPC" and "Outlook-Exchange Transport Protocol". Microsoft provides a sample MAPI/RPC-based application called MFCMAPI to assist developers. It is also widely used as a diagnostics tool by both developers and Microsoft Exchange administrators.
Exchange Server was an entirely new X.400-based client–server mail system with a single database store that also supported X.500 directory services. During its development, Microsoft migrated their own internal email from a Xenix-based system to Exchange Server from April 1993, with all 32,000 Microsoft mailboxes on Exchange by late 1996.
Mail retrieval agent. A mail retrieval agent (MRA) is a computer application that retrieves or fetches e-mail from a remote mail server and works with a mail delivery agent to deliver mail to a local or remote email mailbox. [1] MRA is an automated agent that works on behalf of the user agent checks for the new incoming mail.