Mail message
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... Since its publication in 1982, RFC 822std11(-> 2822prop) has defined the standard
format of textual mail messages on the Internet. Its success has
been such that the RFC 822std11(-> 2822prop) ...
... 822std11(-> 2822prop) mail become even more apparent as gateways
are designed to allow for the exchange of mail messages between RFC
822std11(-> 2822prop) hosts ...
...
It is impossible to be certain that a non-MIME mail message is
actually plain text in the US-ASCII character set ...
... For example, RFC 821std10(-> 2821prop) (SMTP) restricts mail messages to 7bit US-ASCII
data with lines no longer than 1000 characters including any trailing
...
... header fields, it is possible to include, in a standardized way,
arbitrary types of data with RFC 822std11(-> 2822prop) conformant mail messages. No
restrictions imposed by either RFC 821std10(-> 2821prop) or RFC 822std11(-> 2822prop) ...