https://app.knowbase.one/vault/rfc/docid/963
RFC0974: Mail routing and the domain system
Network Working Group Craig Partridge Request for Comments: 974 CSNET CIC BBN Laboratories Inc January 1986 MAIL ROUTING AND THE DOMAIN SYSTEM Status of this Memo ...
https://app.knowbase.one/vault/rfc/docid/1166
RFC1033: Domain Administrators Operations Guide
Network Working Group M. Lottor Request For Comments: 1033 SRI International November 1987 DOMAIN ADMINISTRATORS OPERATIONS GUIDE STATUS OF THIS MEMO ...