electronic mail
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... text messages that are sent
between computer users, within the framework of "electronic mail"
messages. This standard supersedes the one specified in Request For
Comments (RFC) 822std11(-> 2822prop) ...
... audio, or other sorts of structured data in electronic mail messages.
There are several extensions published, such as the MIME document
...
... RFC2046, RFC2049], which describe mechanisms for the
transmission of such data through electronic mail, either by
extending the syntax provided here or by structuring such messages to
conform to this syntax. Those mechanisms are outside of the scope of
...
...
In the context of electronic mail, messages are viewed as having an
envelope and contents. The envelope contains whatever information is
needed to accomplish transmission and delivery ...