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Simple Mail Transfer Protocol.

  • RFC 5321 – The Simple Mail Transfer Protocol (makes RFC 2821 and RFC 821 obsolete as of 2008)
  • RFC 5322 – Internet (i.e. e-mail) Message Format (makes RFC 2822 and RFC 822 obsolete as of 2008)
  • RFC 1869 – Defines the capability for SMTP service extensions, creating Extended SMTP, or ESMTP
  • RFC 1891 – Delivery Status Notification (DSN) extension to SMTP
  • RFC 1892 – The Multipart/Report Content Type for the Reporting of Mail System Administrative Messages
  • RFC 1894 – An Extensible Message Format for Delivery Status Notifications
  • RFC 1895 – The Application/CALS-1840 Content-type
  • RFC 3463 – Enhanced Status Codes for SMTP (makes RFC 1893 obsolete)
  • RFC 1854SMTP service extension for Command Pipelining
  • RFC 2487SMTP Service Extension for Secure SMTP over TLS
  • RFC 2505 – Anti-Spam Recommendations for SMTP MTAs
  • RFC 2554SMTP Service Extension for Authentication
  • RFC 2920SMTP Service Extension for Command Pipelining
  • RFC 3030SMTP Service Extensions for Transmission of Large and Binary MIME Messages
  • RFC 3207SMTP Service Extension for Returning Enhanced Error