messaging system

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messaging system

Although the term may refer to text or instant messaging, it generally refers to an electronic mail delivery system made up of the following functional components, which may be packaged together or independently.

Mail User Agent
The mail user agent (MUA or UA) is the client e-mail program, such as Outlook, Eudora, Mac Mail or Mozilla Thunderbird, which is used to compose, send and receive messages.

Message Transfer Agent
The message transfer agent (MTA), also called the "mail transfer agent," either forwards the message from user agents (MUAs) and other mail servers (MTAs) or delivers it to its own message store (MS) if the recipient is local. Sendmail and Microsoft Exchange are the most widely used MTAs on the Internet. In a large enterprise, there may be several MTA servers (mail servers) dedicated to Internet e-mail while others support internal e-mail.

Message Store
The message store (MS) holds the mail until it is selectively retrieved and deleted by an access server. In the Internet world, a local delivery agent (LDA) writes the messages from the MTA to the message store, and the primary mailbox access protocols used to retrieve the mail are POP and IMAP (see POP3 and IMAP4).

The Internet's SMTP
Internet e-mail, the most ubiquitous messaging system in the world, is based on the SMTP protocol. Prior to the Internet's enormous growth in the late 1990s, numerous proprietary messaging systems were widely used, including cc:Mail, Microsoft Mail, PROFS and DISOSS. See SMTP, messaging middleware, text messaging and instant messaging.
References in periodicals archive ?
Terms of the contract were not disclosed; however, the new system will replace the college's current conventional 700-user Octel voice messaging system.
An extremely scalable, cost-effective messaging service, Novell Internet Messaging System 2.
The VaporStream stream messaging system is one of the many promising new products launching at DEMOfall '06," said Chris Shipley, executive producer of the DEMO Conferences.
The Boston Software Works, located in Boston MA, is a privately held software development firm specializing in high-quality office and electronic messaging system integration and coexistence products.
Analysis will focus on organizational pain points with current messaging systems, the likelihood that organizations will switch to alternative messaging systems, and key decision factors in selecting an alternative messaging system.
This beta-test of this innovative location-based messaging system by the City of Manassas is another example of the type of vision and commitment desperately needed in a post-9-11, post-Hurricane Katrina world.
Analysis will focus on enterprise pain points with current messaging systems, the likelihood that enterprises will switch to alternative messaging systems, and key decision factors in selecting a messaging system.
Instant Technologies, based in Durham, NH, develops software to extend enterprise instant messaging systems.
Liccione will be responsible for Panacya's product and technology strategy, including the company's transformative new solutions to prevent downtime and optimize the performance of enterprise messaging systems.
These and other messaging-related findings are documented in Osterman Research's full report, called "Enterprise Messaging System Trends, 2004 - 2007.