https://app.knowbase.one/vault/rfc/docid/1314
RFC1168: Intermail and Commercial Mail Relay services
Network Working Group A. Westine Request for Comments: 1168 A. DeSchon J. Postel C.E. Ward ...
https://app.knowbase.one/vault/rfc/docid/8790
RFC0808: Summary of computer mail services meeting held at BBN on 10 January 1979
Network Working Group J. Postel Request for Comments: 808 ISI 1 March 1982 SUMMARY OF COMPUTER MAIL SERVICES MEETING ...