28.5 Summary

28.5 Summary

Electronic mail involves a user agent at both ends (the sender and receiver) and two or more message transfer agents . We can divide a mail message into three parts: the envelope, the headers, and the body. We've seen how all three parts are exchanged using SMTP, the Internet standard. All three are exchanged as NVT ASCII characters .

We've also looked at newer extensions for all three parts: extended SMTP for the envelope, non-ASCII headers, and the addition of structure to the body using MIME. The structure and encoding used by MIME allow arbitrary binary data to be exchanged, using existing 7-bit SMTP MTAs.



TCP.IP Illustrated, Volume 1. The Protocols
TCP/IP Illustrated, Vol. 1: The Protocols (Addison-Wesley Professional Computing Series)
ISBN: 0201633469
EAN: 2147483647
Year: 1993
Pages: 378

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