Email Greylisting: An Applicability Statement for SMTP
RFC 6647, “Email Greylisting: An Applicability Statement for SMTP”, is a Proposed Standard document published in June 2012 by M. Kucherawy, D. Crocker. The canonical text is published by the RFC Editor.
Abstract
This document describes the art of email greylisting, the practice of providing temporarily degraded service to unknown email clients as an anti-abuse mechanism.
Greylisting is an established mechanism deemed essential to the repertoire of current anti-abuse email filtering systems. [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 6647 is hosted at rfc-editor.org. Available in TXT,HTML.
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- RFC 6648 Deprecating the "X-" Prefix and Similar Constructs in Application Protocols
- RFC 6645 IP Flow Information Accounting and Export Benchmarking Methodology
- RFC 6649 Deprecate DES, RC4-HMAC-EXP, and Other Weak Cryptographic Algorithms in Kerberos
- RFC 6644 Rebind Capability in DHCPv6 Reconfigure Messages
- RFC 6650 Creation and Use of Email Feedback Reports: An Applicability Statement for the Abuse Reporting Format
- RFC 6643 Translation of Structure of Management Information Version 2 MIB Modules to YANG Modules
- RFC 6651 Extensions to DomainKeys Identified Mail for Failure Reporting