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10. References

10.1. Normative References​

[1] Postel, J., "Simple Mail Transfer Protocol", STD 10, RFC 821, August 1982.

[2] Mockapetris, P., "Domain names - implementation and specification", STD 13, RFC 1035, November 1987.

[3] Braden, R., "Requirements for Internet Hosts - Application and Support", STD 3, RFC 1123, October 1989.

[4] Resnick, P., "Internet Message Format", RFC 5322, October 2008.

[5] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.

[6] American National Standards Institute (formerly United States of America Standards Institute), "USA Code for Information Interchange", ANSI X3.4-1968, 1968.

Note: ANSI X3.4-1968 has been replaced by newer versions with slight modifications, but the 1968 version remains definitive for the Internet.

[7] Crocker, D. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", STD 68, RFC 5234, January 2008.

[8] Hinden, R. and S. Deering, "IP Version 6 Addressing Architecture", RFC 4291, February 2006.

[9] Newman, C., "ESMTP and LMTP Transmission Types Registration", RFC 3848, July 2004.

[10] Klensin, J., Freed, N., and K. Moore, "SMTP Service Extension for Message Size Declaration", STD 10, RFC 1870, November 1995.

[11] Klyne, G., Nottingham, M., and J. Mogul, "Registration Procedures for Message Header Fields", BCP 90, RFC 3864, September 2004.

10.2. Informative References​

[12] Partridge, C., "Mail routing and the domain system", RFC 974, January 1986.

[13] Klensin, J., Freed, N., Rose, M., Stefferud, E., and D. Crocker, "SMTP Service Extensions", STD 10, RFC 1869, November 1995.

[14] Klensin, J., "Simple Mail Transfer Protocol", RFC 2821, April 2001.

[15] Butler, M., Postel, J., Chase, D., Goldberger, J., and J. Reynolds, "Post Office Protocol: Version 2", RFC 937, February 1985.

[16] Myers, J. and M. Rose, "Post Office Protocol - Version 3", STD 53, RFC 1939, May 1996.

[17] Crispin, M., "INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1", RFC 3501, March 2003.

[18] Gellens, R. and J. Klensin, "Message Submission for Mail", RFC 4409, April 2006.

[19] Freed, N., "SMTP Service Extension for Command Pipelining", STD 60, RFC 2920, September 2000.

[20] Vaudreuil, G., "SMTP Service Extensions for Transmission of Large and Binary MIME Messages", RFC 3030, December 2000.

[21] Freed, N. and N. Borenstein, "Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies", RFC 2045, November 1996.

[22] Klensin, J., Freed, N., Rose, M., Stefferud, E., and D. Crocker, "SMTP Service Extension for 8bit-MIMEtransport", RFC 1652, July 1994.

[23] Moore, K., "MIME (Multipurpose Internet Mail Extensions) Part Three: Message Header Extensions for Non-ASCII Text", RFC 2047, November 1996.

Additional References​

For a complete list of references, including [24] through [47], please consult the original RFC 5321 text.

  • RFC 5322: Internet Message Format (companion document)
  • RFC 6531: SMTP Extension for Internationalized Email
  • RFC 7504: SMTP 521 and 556 Reply Codes
  • RFC 8314: Cleartext Considered Obsolete: Use of TLS for Email Submission and Access
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