<messaging> (MTA, Mail Transfer Agent) Any program responsible for delivering e-mail messages. Upon receiving a message from a Mail User Agent or another MTA, often by SMTP over the Internet, it stores it temporarily locally and analyses the recipients and delivers it to any local addressees and/or forwards it to other remote MTAs (routing) for delivery to remote recipients. In either case it may edit and/or add to the message headers. The most widely used MTA for Unix is sendmail, which communicates using SMTP. [Other OSes?] RFC 2821 (SMTP) expands MTA as "Mail Transfer Agent" though this is less common. Alternatives with "Transport" are also seen but less correct. (2007-06-01)

Within the Internet email system, a message transfer agent (MTA),MTA=Message Transfer Agent (similar to X.400 name) is found, e.

1. <tool, messaging> A program that distributes files or information in response to requests sent via {electronic mail}. Examples on the Internet include Almanac and netlib. Mail servers are also used on Bitnet. In the days before Internet access was widespread and UUCP mail links were common, mail servers could be used to provide remote services which might now be provided via FTP or WWW. 2. <messaging> (Or "mail hub") A computer used to store and/or forward electronic mail. (1995-05-05)

Message Transfer Agent

Message Transfer Agent

<messaging> A server running SMTP Message Transfer Agent software that accepts incoming electronic mail and either delivers it locally or forwards it to another server. The mail exchanger to use for a given domain can be discovered by querying DNS for Mail Exchange Records. (2007-01-29)

One of the two techniques for communicating between parallel processes (the other being shared memory). A common use of message passing is for communication in a parallel computer. A process running on one processor may send a message to a process running on the same processor or another. The actual transmission of the message is usually handled by the run-time support of the language in which the processes are written, or by the operating system. Message passing scales better than shared memory, which is generally used in computers with relatively few processors. This is because the total communications bandwidth usually increases with the number of processors. A message passing system provides primitives for sending and receiving messages. These primitives may by either synchronous or asynchronous or both. A synchronous send will not complete (will not allow the sender to proceed) until the receiving process has received the message. This allows the sender to know whether the message was received successfully or not (like when you speak to someone on the telephone). An asynchronous send simply queues the message for transmission without waiting for it to be received (like posting a letter). A synchronous receive primitive will wait until there is a message to read whereas an asynchronous receive will return immediately, either with a message or to say that no message has arrived. Messages may be sent to a named process or to a named mailbox which may be readable by one or many processes. Transmission involves determining the location of the recipient and then choosing a route to reach that location. The message may be transmitted in one go or may be split into packets which are transmitted independently (e.g. using wormhole routing) and reassembled at the receiver. The message passing system must ensure that sufficient memory is available to buffer the message at its destination and at intermediate nodes. Messages may be typed or untyped at the programming language level. They may have a priority, allowing the receiver to read the highest priority messages first. Some message passing computers are the {MIT J-Machine (http://ai.mit.edu/projects/cva/cva_j_machine.html)}, the {Illinois Concert Project (http://www-csag.cs.uiuc.edu/projects/concert.html)} and transputer-based systems. Object-oriented programming uses message passing between objects as a metaphor for procedure call. (1994-11-11)

A stock transfer agent, transfer agent, share registry or transfer agency is an entity, usually a third party firm unrelated to security transactions, that manages the change in ownership of company stock or investment fund shares, maintains a register of ownership and acts as paying agent for the payment of dividends and other distributions to investors. The name derives from the impartial intermediary role a transfer agent plays in validating and registering the purchase of new ownership shares and, in the case of a transfer of ownership, cancelling the name and certificate of shareholders who sell shares and substituting the new owner's name on the official master shareholder register.

n. a person or company retained by a corporation to process transfers and registration of shares of stock (stock certificates). One difficulty is that the stock certificates do not always include the name and address of the current transfer agent, but the information can be obtained from the corporation or a stockbroker. See also: share stock

Business brokers, also called business transfer agents, or intermediaries, assist buyers and sellers of privately held businesses in the buying and selling process. They typically estimate the value of the business; advertise it for sale with or without disclosing its identity; handle the initial potential buyer interviews, discussions, and negotiations with prospective buyers; facilitate the progress of the due diligence investigation and generally assist with the business sale.