RFC 6647: Email Greylisting: An Applicability Statement for SMTP

This document describes the art of email greylisting, the practice of providing temporarily degraded service to unknown email clients as an anti-abuse…

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Outgoing relationships (6 related RFCs)

Normative reference — RFC 5321: Simple Mail Transfer Protocol
Normative reference — RFC 5598: Internet Mail Architecture
Informative reference — RFC 2131: Dynamic Host Configuration Protocol
Informative reference — RFC 5322: Internet Message Format
Informative reference — RFC 3022: Traditional IP Network Address Translator (Traditional NAT)
Informative reference — RFC 5782: DNS Blacklists and Whitelists

Incoming relationships (1 related RFC)

Informatively referenced by — RFC 6710: Simple Mail Transfer Protocol Extension for Message Transfer Priorities