2821: Simple Mail Transfer Protocol.

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This document is a self-contained specification of the basic protocol for the Internet electronic mail transport. It consolidates, updates and clarifies, but doesn't add new or change existing functionality of the following:

Status PROPOSED STANDARD
Format TXT=192504 bytes
Authors
Date April 2001
Keyphrases SMTP command mail RFC

Obsoletes

STD0010
RFC0821: Simple Mail Transfer Protocol.
Obsoletes
- RFC0788: Simple Mail Transfer Protocol.
  Obsoletes
  - RFC0780: Mail Transfer Protocol.
    Obsoletes
    - RFC0772: Mail Transfer Protocol.
RFC0974: Mail routing and the domain system.
RFC1869: SMTP Service Extensions.
Obsoletes
- RFC1651: SMTP Service Extensions.
  Obsoletes
  - RFC1425: SMTP Service Extensions. J. Klensin, WG Chair,

References

RFC793: Transmission Control Protocol.
RFC821: Simple Mail Transfer Protocol.
RFC822: STANDARD FOR THE FORMAT OF ARPA INTERNET TEXT
RFC937: Post Office Protocol: Version 2.
RFC974: Mail routing and the domain system.
RFC1034: Domain names - concepts and facilities.
RFC1035: Domain names - implementation and specification.
RFC1047: Duplicate messages and
RFC1056: PCMAIL: A distributed mail system for personal computers.
RFC1123: Requirements for Internet Hosts - Application and Support.
RFC1176: Interactive Mail Access Protocol: Version 2.
RFC1652: SMTP Service Extension for 8bit-MIMEtransport.
RFC1830: SMTP Service Extensions for Transmission of Large and Binary MIME Messages.
RFC1847: Security Multiparts for MIME: Multipart/Signed and Multipart/Encrypted.
RFC1869: SMTP Service Extensions.
RFC1870: SMTP Service Extension for Message Size Declaration.
RFC1891: SMTP Service Extension for Delivery Status Notifications.
RFC1893: Enhanced Mail System Status Codes.
RFC1894: An Extensible Message Format for Delivery Status Notifications.
RFC1939: Post Office Protocol - Version 3.
RFC1985: SMTP Service Extension for Remote Message Queue Starting.
RFC2045: Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies.
RFC2047: MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text.
RFC2060: Internet Message Access Protocol - Version 4rev1.
RFC2156: MIXER (Mime Internet X.400 Enhanced Relay): Mapping between X.400 and RFC 822/MIME.
RFC2234: Augmented BNF for Syntax Specifications:
RFC2298: An Extensible Message Format for Message Disposition Notifications.
RFC2373: IP Version 6 Addressing Architecture.
RFC2440: OpenPGP Message Format.
RFC2476: Message Submission.
RFC2633: S/MIME Version 3 Message Specification.
RFC2822: Internet Message Format.
RFC2920: SMTP Service Extension for Command Pipelining.
RFC2979: Behavior of and Requirements for Internet Firewalls.

Referenced by

RFC2800: Internet Official Protocol Standards.
RFC2822: Internet Message Format.
RFC3155: End-to-end Performance Implications of Links with Errors.
RFC3205: On the use of HTTP as a Substrate.
RFC3207: SMTP Service Extension for Secure SMTP over Transport Layer Security.
RFC3249: Implementers Guide for Facsimile Using Internet Mail.
RFC3297: Content Negotiation for Messaging Services based on Email.
RFC3335: MIME-based Secure Peer-to-Peer Business Data Interchange over the Internet.
RFC3340: The Application Exchange Core.
RFC3390: Increasing TCP's Initial Window.
RFC3395: Remote Network Monitoring MIB Protocol Identifier Reference Extensions.
RFC3459: Critical Content Multi-purpose Internet Mail Extensions (MIME) Parameter.
RFC3470: Guidelines for the Use of Extensible Markup Language (XML) within IETF Protocols.
RFC3501: INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1.
RFC3502: Internet Message Access Protocol (IMAP) - MULTIAPPEND Extension.
RFC3552: Guidelines for Writing RFC Text on Security Considerations.
RFC3599: Request for Comments Summary RFC Numbers 3500-3599.
RFC3675: .sex Considered Dangerous.
RFC3676: The Text/Plain Format and DelSp Parameters.
RFC3696: Application Techniques for Checking and Transformation of Names.
RFC3730: Extensible Provisioning Protocol (EPP).
RFC3773: High-Level Requirements for Internet Voice Mail.
RFC3795: Survey of IPv4 Addresses in Currently Deployed IETF Application Area Standards Track and Experimental Documents.
RFC3798: Message Disposition Notification.
RFC3801: Voice Profile for Internet Mail - version 2 (VPIMv2).
RFC3805: Printer MIB v2.
RFC3848: ESMTP and LMTP Transmission Types Registration.
RFC3854: Securing X.400 Content with Secure/Multipurpose Internet Mail Extensions (S/MIME).
RFC3864: Registration Procedures for Message Header Fields.
RFC3865: A No Soliciting Simple Mail Transfer Protocol (SMTP) Service Extension.
RFC3885: SMTP Service Extension for Message Tracking.
RFC3887: Message Tracking Query Protocol.
RFC3920: Extensible Messaging and Presence Protocol (XMPP): Core.
RFC3930: The Protocol versus Document Points of View in Computer Protocols.
RFC3965: A Simple Mode of Facsimile Using Internet Mail.
RFC3974: SMTP Operational Experience in Mixed IPv4/v6 Environments.
RFC4021: Registration of Mail and MIME Header Fields.
RFC4038: Application Aspects of IPv6 Transition.
RFC4095: Attaching Meaning to Solicitation Class Keywords.
RFC4096: Policy-Mandated Labels Such as "Adv:" in Email Subject Headers Considered Ineffective At Best.
RFC4141: SMTP and MIME Extensions for Content Conversion.
RFC4161: Guidelines for Optional Services for Internet Fax Gateways.
RFC4239: Internet Voice Messaging (IVM).
RFC4240: Basic Network Media Services with
RFC4356: Mapping Between the Multimedia Messaging Service (MMS) and Internet Mail.
RFC4367: What's in a Name: False Assumptions about DNS Names.
RFC4405: SMTP Service Extension for Indicating the Responsible Submitter of an E-Mail Message.
RFC4406: Sender ID: Authenticating E-Mail.
RFC4408: Sender Policy Framework (SPF) for Authorizing Use of Domains in E-Mail, Version 1.
RFC4409: Message Submission for Mail.
RFC4416: Goals for Internet Messaging to Support Diverse Service Environments.
RFC4468: Message Submission BURL Extension.
RFC4472: Operational Considerations and Issues with IPv6
RFC4496: Open Pluggable Edge Services (OPES) SMTP Use Cases.
RFC4524: COSINE LDAP/X.500 Schema.
RFC4550: Internet Email to Support Diverse Service Environments (Lemonade) Profile.
RFC4686: Analysis of Threats Motivating DomainKeys Identified Mail (DKIM).
RFC4722: Media Server Control Markup Language (MSCML) and Protocol.