tailieunhanh - Chapter-26-Electronic mail-clients

RFC 2821 is a recent update to the venerable RFC 821, which dates from the early 1980s. It defines the Simple Mail Transfer Protocol or SMTP. It specifies how to send mail round the network. For most people it’s not very interesting, but it does impose some restrictions such as the basic line length limit. Apart from this problem (which Microsoft abuses), most mail systems adhere to SMTP. | 2 April 2003 17 00 47 The Complete FreeBSD page 469 In this chapter Mail formats Mail user agents Files folders or directories Replying to a message Using folders Deleting messages Tagging messages Configuring mutt Mail aliases Mail headers Electronic mail clients Electronic mail usually called email e-mail or simply mail is a method of sending messages to other people on the Net. As with other network services there are two parts to mail software The part of the mail system that most users know is the client the Mail User Agent or MUA the program that interacts with the user and handles incoming and outgoing mail. In this chapter we ll look at my favourite MUA mutt and we ll briefly touch on what others are available. The server part is the Mail Transfer Agent or MTA. As the name suggests it is responsible for moving mail from one system to another. We ll look at MTAs in the next chapter Chapter 27 Electronic mail servers. Mail formats Email is defined by a number of Internet standards the so-called RFCs or Requests For Comments. You can browse the RFCs at http rfcs . Here are the most important ones. RFC 2821 is a recent update to the venerable RFC 821 which dates from the early 1980s. It defines the Simple Mail Transfer Protocol or SMTP. It specifies how to send mail round the network. For most people it s not very interesting but it does impose some restrictions such as the basic line length limit. Apart from this problem which Microsoft abuses most mail systems adhere to SMTP v 2003 04 02 04 07 59 469 2 April 2003 17 00 47 The Complete FreeBSD . tools page 470 Mail formats 470 Similarly RFC 2822 replaces RFC 822. It defines the basic format of a mail message. It defines the headers To Cc Subject and so on and a simple body made up of US-ASCII text the message itself. This was fine for when it was written but it can t handle the more complex formats used nowdays such as images binary files or embedded messages. It also .

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