This drives competition and promotes quality. Virtually all open standards protocols are implemented in high quality free software. HyperText Transport Protocol implements the language used between Web servers and browsers. HTTP is a protocol with the lightness and speed necessary for a distributed collaborative hypermedia information system. A mail user agent, or MUA, is an application run directly by a user.
Transfer agents are responsible for properly routing messages to their destination.
While their function is hidden from the average user, theirs is by far the most complex part of getting messages from their source to their destination. The language spoken between transfer agents is known as a transfer protocol. Delivery agents are used to place a message into a user's mail-box. Examples of delivery agents are POP, IMAP, and the proprietary Groupwise. Get A Certificate Homework 1.