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 email 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 email while others support internal email.

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 email, 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 ?
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.