https://app.knowbase.one/vault/rfc/docid/1674
RFC1495: Mapping between X.400 and RFC-822 Message Bodies
Network Working Group H. Alvestrand Request for Comments: 1495 SINTEF DELAB Updates: 1327 S. Kille ISODE Consortium ...
https://app.knowbase.one/vault/rfc/docid/1183
RFC1049: Content-type header field for Internet messages
Network Working Group M. Sirbu Request for Comments: 1049 CMU March 1988 A CONTENT-TYPE HEADER FIELD FOR INTERNET MESSAGES STATUS OF TH...