text messages
Click on the red underlined text to get to the source
...
This standard specifies a syntax for text messages that are sent
between computer users, within the framework of "electronic mail ...
... 822std11(-> 2822prop), "Standard for the Format of ARPA Internet Text
Messages" [RFC822], updating it to reflect current practice and
incorporating incremental changes that were specified in other RFCs
...
...
This standard specifies a syntax only for text messages. In
particular, it makes no provision for the transmission of images,
...
... Crocker, D., "Standard for the Format of ARPA Internet Text Messages", RFC 822std11(-> 2822prop), August 1982. ...