RFC 4408: Sender Policy Framework (SPF) for Authorizing Use of Domains in E-Mail, Version 1

E-mail on the Internet can be forged in a number of ways. In particular, existing protocols place no restriction on what a sending host can use as the…

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Outgoing relationships (15 related RFCs)

Normative reference — RFC 2119: Key words for use in RFCs to Indicate Requirement Levels
Normative reference — RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
Normative reference — RFC 1035: Domain names - implementation and specification
Normative reference — RFC 1123: Requirements for Internet Hosts - Application and Support
Normative reference — RFC 2821: Simple Mail Transfer Protocol
Normative reference — RFC 3864: Registration Procedures for Message Header Fields
Normative reference — RFC 3464: An Extensible Message Format for Delivery Status Notifications
Informative reference — RFC 1034: Domain names - concepts and facilities
Informative reference — RFC 3851: Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.1 Message Specification
Informative reference — RFC 2440: OpenPGP Message Format
Informative reference — RFC 3833: Threat Analysis of the Domain Name System (DNS)
Informative reference — RFC 4409: Message Submission for Mail
Informative reference — RFC 2554: SMTP Service Extension for Authentication
Informative reference — RFC 1983: Internet Users' Glossary
Informative reference — RFC 3696: Application Techniques for Checking and Transformation of Names

Incoming relationships (13 related RFCs)

Updated by, Normatively referenced by — RFC 6652: Sender Policy Framework (SPF) Authentication Failure Reporting Using the Abuse Reporting Format
Obsoleted by — RFC 7208: Sender Policy Framework (SPF) for Authorizing Use of Domains in Email, Version 1
Normatively referenced by — RFC 4406: Sender ID: Authenticating E-Mail
Normatively referenced by — RFC 6591: Authentication Failure Reporting Using the Abuse Reporting Format
Normatively referenced by — RFC 7073: A Reputation Response Set for Email Identifiers
Normatively referenced by — RFC 6686: Resolution of the Sender Policy Framework (SPF) and Sender ID Experiments
Informatively referenced by — RFC 7071: A Media Type for Reputation Interchange
Informatively referenced by — RFC 5518: Vouch By Reference
Informatively referenced by — RFC 5039: The Session Initiation Protocol (SIP) and Spam
Informatively referenced by — RFC 5585: DomainKeys Identified Mail (DKIM) Service Overview
Informatively referenced by — RFC 6650: Creation and Use of Email Feedback Reports: An Applicability Statement for the Abuse Reporting Format (ARF)
Informatively referenced by — RFC 6577: Authentication-Results Registration Update for Sender Policy Framework (SPF) Results
Informatively referenced by — RFC 7601: Message Header Field for Indicating Message Authentication Status