RFC 7505: A "Null MX" No Service Resource Record for Domains That Accept No Mail

Internet mail determines the address of a receiving server through the DNS, first by looking for an MX record and then by looking for an A/AAAA record as a…

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Outgoing relationships (7 related RFCs)

Normative reference — RFC 2119: Key words for use in RFCs to Indicate Requirement Levels
Normative reference — RFC 1035: Domain names - implementation and specification
Normative reference — RFC 5321: Simple Mail Transfer Protocol
Normative reference — RFC 7504: SMTP 521 and 556 Reply Codes
Informative reference — RFC 2782: A DNS RR for specifying the location of services (DNS SRV)
Informative reference — RFC 5598: Internet Mail Architecture
Informative reference — RFC 7208: Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1

Incoming relationships (1 related RFC)

Informatively referenced by — RFC 7504: SMTP 521 and 556 Reply Codes