RFC1537: Common DNS Data File Configuration Errors
Network Working Group P. Beertema Request for Comments: 1537 CWI Category: Informational October 1993 Common DNS Data File Configuration Errors Status of this ...
RFC3974: SMTP Operational Experience in Mixed IPv4/v6 Environments
Network Working Group M. Nakamura Request for Comments: 3974 Kyoto University Category: Informational J. Hagino IIJ Research Laboratory ...
RFC7505: A "Null MX" No Service Resource Record for Domains That Accept No Mail
Internet Engineering Task Force (IETF) J. Levine Request for Comments: 7505 Taughannock Networks Category: Standards Track M. Delany ISSN: 2070-1721 Apple Inc. ...