Next: Electronic Mail Functions Up: Lecture 5
Nature of Electronic Mail
Electronic mail is a messaging system modelled on postal mail that sends, receives and stores messages solely within electronic media.
Unlike faxes, the post and telegrams e-mail messages never need to be transcribed onto a physical medium.
Unlike the phone, e-mail is an asynchronous messaging service.
Unlike paging and SMS, e-mail is not for real-time messaging.
Electronic mail systems consist of
|user agents||let people read and send messages|
|message transfer agents||move messages from source to destination|
|mailboxes||store messages sent to recipients|
Typical user agents are command, GUI or web based programs.
Typical message transfer agents are daemons running on servers.
Typical mailboxes are files.
Typical e-mail systems support 5 basic functions
|composition||creation and addressing of messages and answers|
|display||enabling viewing/rendering of incoming messages|
|disposition||dealing with message upon receipt|
|reporting||telling originator what happened to message|
|transfer||movement of messages from originator to recipient|
|Lecture 5||XHTML 1.0||Slide 1|