RFCs conformed
SMTP and Extensions
- RFC 5321 - Simple Mail Transfer Protocol
- RFC 5321bis - Simple Mail Transfer Protocol (draft 18)
- RFC 2033 - Local Mail Transfer Protocol
- RFC 6152 - SMTP Service Extension for 8-bit MIME Transport
- RFC 1870 - SMTP Service Extension for Message Size Declaration
- RFC 3030 - SMTP Service Extensions for Transmission of Large and Binary MIME Messages
- RFC 2852 - Deliver By SMTP Service Extension
- RFC 2920 - SMTP Service Extension for Command Pipelining
- RFC 3461 - Simple Mail Transfer Protocol (SMTP) Service Extension for Delivery Status Notifications (DSNs)
- RFC 2034 - SMTP Service Extension for Returning Enhanced Error Codes
- RFC 3207 - SMTP Service Extension for Secure SMTP over Transport Layer Security
- RFC 3865 - A No Soliciting Simple Mail Transfer Protocol (SMTP) Service Extension
- RFC 4954 - SMTP Service Extension for Authentication
- RFC 4865 - SMTP Submission Service Extension for Future Message Release
- RFC 6531 - SMTP Extension for Internationalized Email
- RFC 6710 - Simple Mail Transfer Protocol Extension for Message Transfer Priorities
- RFC 8689 - SMTP Require TLS Option
- RFC 2831 - Using Digest Authentication as a SASL Mechanism
Message Authentication
DKIM
- RFC 6376 - DomainKeys Identified Mail (DKIM) Signatures
- RFC 6541 - DomainKeys Identified Mail (DKIM) Authorized Third-Party Signatures
- RFC 6651 - Extensions to DomainKeys Identified Mail (DKIM) for Failure Reporting
- RFC 8032 - Edwards-Curve Digital Signature Algorithm (EdDSA)
- RFC 4686 - Analysis of Threats Motivating DomainKeys Identified Mail (DKIM)
- RFC 5016 - Requirements for a DomainKeys Identified Mail (DKIM) Signing Practices Protocol
- RFC 5585 - DomainKeys Identified Mail (DKIM) Service Overview
- RFC 5672 - DomainKeys Identified Mail (DKIM) Signatures – Update
- RFC 5863 - DomainKeys Identified Mail (DKIM) Development, Deployment, and Operations
- RFC 6377 - DomainKeys Identified Mail (DKIM) and Mailing Lists
SPF
- RFC 7208 - Sender Policy Framework (SPF)
- RFC 6652 - Sender Policy Framework (SPF) Authentication Failure Reporting Using the Abuse Reporting Format
ARC
DMARC
- RFC 7489 - Domain-based Message Authentication, Reporting, and Conformance (DMARC)
- RFC 8601 - Message Header Field for Indicating Message Authentication Status
- RFC 8616 - Email Authentication for Internationalized Mail
- RFC 7960 - Interoperability Issues between Domain-based Message Authentication, Reporting, and Conformance (DMARC) and Indirect Email Flows
Reporting
- RFC 5965 - An Extensible Format for Email Feedback Reports
- RFC 6430 - Email Feedback Report Type Value: not-spam
- RFC 6590 - Redaction of Potentially Sensitive Data from Mail Abuse Reports
- RFC 6591 - Authentication Failure Reporting Using the Abuse Reporting Format
- RFC 6650 - Creation and Use of Email Feedback Reports: An Applicability Statement for the Abuse Reporting Format (ARF)
Transport Security
DANE
- RFC 6698 - The DNS-Based Authentication of Named Entities (DANE) Transport Layer Security (TLS) Protocol: TLSA
- RFC 7671 - The DNS-Based Authentication of Named Entities (DANE) Protocol: Updates and Operational Guidance
MTA-STS
SMTP TLS Reporting
- RFC 822 - Standard for ARPA Internet Text Messages
- RFC 5322 - Internet Message Format
- RFC 2045 - Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies
- RFC 2046 - Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types
- RFC 2047 - MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text
- RFC 2048 - Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures
- RFC 2049 - Multipurpose Internet Mail Extensions (MIME) Part Five: Conformance Criteria and Examples
- RFC 2231 - MIME Parameter Value and Encoded Word Extensions: Character Sets, Languages, and Continuations
- RFC 2557 - MIME Encapsulation of Aggregate Documents, such as HTML (MHTML)
- RFC 2183 - Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field
- RFC 2392 - Content-ID and Message-ID Uniform Resource Locators
- RFC 3282 - Content Language Headers
- RFC 6532 - Internationalized Email Headers
- RFC 2152 - UTF-7 - A Mail-Safe Transformation Format of Unicode
- RFC 2369 - The Use of URLs as Meta-Syntax for Core Mail List Commands and their Transport through Message Header Fields
- RFC 2919 - List-Id: A Structured Field and Namespace for the Identification of Mailing Lists
- RFC 3339 - Date and Time on the Internet: Timestamps
Sieve
- RFC 5228 - Sieve: An Email Filtering Language
- RFC 3894 - Copying Without Side Effects
- RFC 5173 - Body Extension
- RFC 5183 - Environment Extension
- RFC 5229 - Variables Extension
- RFC 5230 - Vacation Extension
- RFC 5231 - Relational Extension
- RFC 5232 - Imap4flags Extension
- RFC 5233 - Subaddress Extension
- RFC 5235 - Spamtest and Virustest Extensions
- RFC 5260 - Date and Index Extensions
- RFC 5293 - Editheader Extension
- RFC 5429 - Reject and Extended Reject Extensions
- RFC 5435 - Extension for Notifications
- RFC 5463 - Ihave Extension
- RFC 5490 - Extensions for Checking Mailbox Status and Accessing Mailbox Metadata
- RFC 5703 - MIME Part Tests, Iteration, Extraction, Replacement, and Enclosure
- RFC 6009 - Delivery Status Notifications and Deliver-By Extensions
- RFC 6131 - Sieve Vacation Extension: “Seconds” Parameter
- RFC 6134 - Externally Stored Lists
- RFC 6558 - Converting Messages before Delivery
- RFC 6609 - Include Extension
- RFC 7352 - Detecting Duplicate Deliveries
- RFC 8579 - Delivering to Special-Use Mailboxes
- RFC 8580 - File Carbon Copy (FCC)
- RFC 9042 - Delivery by MAILBOXID
- REGEX-01 - Regular Expression Extension (draft-ietf-sieve-regex-01)