5.1 INTRODUCTION
Connected: An Internet Encyclopedia
5.1 INTRODUCTION
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RFC 1123
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5. ELECTRONIC MAIL -- SMTP and RFC-822
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Next: 5.2 PROTOCOL WALK-THROUGH
5.1 INTRODUCTION
5.1 INTRODUCTION
In the TCP/IP protocol suite, electronic mail in a format
specified in RFC-822 [SMTP:2] is transmitted using the Simple Mail
Transfer Protocol (SMTP) defined in RFC-821 [SMTP:1].
While SMTP has remained unchanged over the years, the Internet
community has made several changes in the way SMTP is used. In
particular, the conversion to the Domain Name System (DNS) has
caused changes in address formats and in mail routing. In this
section, we assume familiarity with the concepts and terminology
of the DNS, whose requirements are given in Section 6.1.
RFC-822 specifies the Internet standard format for electronic mail
messages. RFC-822 supercedes an older standard, RFC-733, that may
still be in use in a few places, although it is obsolete. The two
formats are sometimes referred to simply by number ("822" and
"733").
RFC-822 is used in some non-Internet mail environments with
different mail transfer protocols than SMTP, and SMTP has also
been adapted for use in some non-Internet environments. Note that
this document presents the rules for the use of SMTP and RFC-822
for the Internet environment only; other mail environments that
use these protocols may be expected to have their own rules.
Next: 5.2 PROTOCOL WALK-THROUGH
Connected: An Internet Encyclopedia
5.1 INTRODUCTION
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