メールのRFC

• RFC 5321 Simple Mail Transfer Protocol
  • obsolutes RFC 2821
    • obsolutes RFC 974 Mail routing and the domain system
  • obsolutes RFC 821

• 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 5322 Internet Message Format

• RFC 5248 A Registry for SMTP Enhanced Mail System Status Codes
• RFC 3464 Enhanced Mail System Status Codes
  • obsolutes RFC 1893

• RFC 3464 An Extensible Message Format for Delivery Status Notifications
• RFC 3461 Simple Mail Transfer Protocol (SMTP) Service Extension for Delivery Status Notifications (DSNs)