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12.  Normative References

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

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

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

                  Partridge, C., "Mail routing and the domain
                  system", STD 10, RFC 974, January 1986.

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

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

12. インターネット標準にかかわる参照資料

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

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

[SMTP-MTA] 　　　　　Postel, J., “Simple Mail Transfer Protocol”, STD 10, RFC 821, August 1982.

Partridge, C., “Mail routing and the domain system”, STD 10, RFC 974, January 1986.

Braden, R., “Requirements for Internet Hosts – Application and Support”, STD 3, RFC 1123, October
1989.

Klensin, J., “Simple Mail Transfer Protocol”, RFC 2821, April 2001.

13.  Informative References

※ (編集注)　「13. 情報に関する参照資料」は次ページにまとまます。

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