https://app.knowbase.one/vault/rfc/docid/7970
RFC0733: Standard for the format of ARPA network text messages
RFC # 733 NIC # 41952 Obsoletes: RFC #561 (NIC #18516) RFC #680 (NIC #32116) RFC #724 (NIC #37435) STANDARD FOR THE FORMAT OF ARPA NETWORK TEXT MESSAGES(1) 21 November 1977 ...