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 ?
Rather than forcing UST to scrap its existing email infrastructure, our secure email gateway and client software were layered onto existing messaging systems.
Under the contract, Tecnomen would supply a voice mail system and a unified messaging system.
For some time we had been looking to move from our current proprietary voice messaging system to one that was more industry standards based," said Gary Kontich, network administrator for COCC.
Designed to ensure the privacy and confidentiality of electronic communications, the Web-based VaporStream stream messaging system helps eliminate some of the inherent risks and costs of traditional e-mail and instant messaging (IM) systems, such as spam, viruses and high storage costs.
The study will focus on how organizations are managing messaging systems, the email and instant messaging management problems they face, how they are dealing with messaging security issues, their preferences for internally managed versus hosted systems, the role that messaging archiving will play, the market for secure/encrypted messaging and other issues.
Everyone from wireless carriers to public safety officials and marketers have been seeking a geographically targeted messaging system that preserves the privacy of wireless subscribers and works with all wireless technologies and carriers.
Analysis of the role that archiving, instant messaging, presence and email security will play in enterprise decisions on upgrading existing systems and migrating to new 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.
We had to have these and other reports to run our voice messaging system at the level students and staff expected.