messaging system

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messaging system

A messaging system sends text messages from one user to one or more other users. Image attachments are also typically supported. This definition covers the components of an Internet-based email system. For text and instant messaging, see text messaging and instant messaging.

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

Message Transfer Agent (Server)
The message transfer agent (MTA), or "mail transfer agent," is a mail server that forwards messages from user agents (MUAs) or delivers mail to its own message store (MS) for local recipients. Sendmail and Microsoft Exchange are the most widely used MTAs, and in a large enterprise, there may be several MTAs deployed.

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

The Internet's SMTP
Internet email 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 ?
But broadcaster John Humphrys was less convinced that regional accents in texting is a sign that electronic messaging is good for children's linguistic skills.
* Assessing and mitigating the risks that may result from a failure to capture appropriate electronic messaging records
Fundamentally, you want to put the electronic messaging policies, management guidelines, operational procedures and tools in place that will best defend your organization against possible risk.
LexisONE, a news and research service from LexisNexis designed for small law firms, now provides access to a secure electronic messaging service called CertifiedMail.com
EDI provides standard message formats and element dictionaries that enable businesses to exchange data via any electronic messaging service.
The state-of-the-art unit is a compact instrument that combines two-way radio, cell phone, pager and electronic messaging. Radio lets inside staff instantly contact an appraiser to reschedule appointments and get answers to questions.
Xpedite Systems Inc., a global leader in enhanced electronic messaging, has leased 90,000 square feet for a build-to-suit headquarters in Tinton Falls, N.J.
Electronic messaging has its roots in the early days of the ARPANET, later known as the Internet.
For example, the Electronic Messaging Association puts the total, worldwide value of e-mail to business users at $12.7 billion (basing the figure primarily on the savings associated with sending a message across the street or across the country at the same price).
According to Thomas, there are four venues where multimedia is used: conferencing, video conferencing, filing and electronic messaging.
The Electronic Messaging Association's Message Attachment Work Group (MAWG) is testing the feasibility of a standard means of conveying message attachments between different messaging systems.

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