This program was a little different in that it could receive e-mail from various networks, fix the messages that would otherwise have been rejected, and pass the messages along to their final destination. Which was created by Eric Allman while at U. Other protocols forced the development of sendmail, These protocols developed as a means for clients to retrieve mail. Since its inception, SMTP has continued to develop to what it is today.Īs SMTP continued to develop, other protocols emerged to work with mail servers servers, such as the Post Office Protocol (POP) and the Internet Mail Access Protocol (IMAP). SMTP has been adopted primarily as the standard for transferring electronic mail over the Internet. One such standard is the Mail Transfer Protocol, which developed in 1981 into the Simple Mail Transfer Protocol (SMTP). Some of these standards are still used today. In the early days of the Internet, many standards called Requests for Comments ( RFCs) were created. For more information on the available clients that communicate with the servers you set up in this chapter, see Chapter 6. In addition to handling incoming mail sent to your server, clients need to retrieve their mail from your machine. From there, you can take it farther by setting it up to process mailing lists, to process mail for virtual domains, and even to relay mail to another mail server.

This chapter covers the basics of setting up an e-mail server on your system. MUAs are clients that communicate with the MTAs. The mail system can be divided into two main parts: Mail Transfer Agents and Mail User Agents ( MUAs). The muscle behind this mass transfer of communications are Mail Transfer Agents ( MTAs). The point of e-mail is to communicate with others - sending letters, notes, and more. Taken up by e-mail than by other sources. Of any application used on a computer system, e-mail ranks number.

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