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- [1] 単純メイル転送プロトコル。 Simple Mail Transfer Protocol。
- [2] [[インターネット・メイル]]を[[送信]]・[[中継]]するための[[プロトコル]]。

* 仕様書

[REFS[
- [8] [CITE@en[RFC 5321 - Simple Mail Transfer Protocol]] ([TIME[2016-01-10 14:43:30 +09:00]] 版) <https://tools.ietf.org/html/rfc5321>
]REFS]

* 関連

[11] 
[[OPES]]

* 歴史

[9] [CITE@en[RFC 788 - Simple Mail Transfer Protocol]], [TIME[2021-01-31T15:48:31.000Z]], [TIME[2021-03-10T06:16:16.659Z]] <https://tools.ietf.org/html/rfc788#page-27>

- [[RFC 788の日時形式]]

[10] [CITE@en[RFC 821 - Simple Mail Transfer Protocol]], [TIME[2021-01-24T15:39:07.000Z]], [TIME[2021-03-10T06:19:05.623Z]] <https://tools.ietf.org/html/rfc821>

- [[RFC 821の日時形式]]

[7] [CITE@en[RFC 2821 - Simple Mail Transfer Protocol]] ([TIME[2016-01-08 20:02:57 +09:00]] 版) <https://tools.ietf.org/html/rfc2821>

* メモ

[3]
[[SMTP]] と [[RFC 822]] ([[RFC 2822]]) が区別できない人がたまにいらっしゃいます。。。
[WEAK[([[822]] に名前が付いていないのもそりゃー悪いけどさー。)]]

[4] [CITE@en[RFC 7372 - Email Authentication Status Codes]]
( ([TIME[2014-09-26 17:34:15 +09:00]] 版))
<https://tools.ietf.org/html/rfc7372>

[FIG(amazon)[
SMTP
]FIG]

[5] [CITE@en[Mons/AnyEvent-SMTP: Async SMTP client and server based on AnyEvent]]
([TIME[2016-03-28 17:01:23 +09:00]] 版)
<https://github.com/Mons/AnyEvent-SMTP>

[6] [CITE@ja[SMTP プロトコル拡張機能]]
([TIME[2015-11-30 15:13:02 +09:00]] 版)
<https://technet.microsoft.com/ja-jp/library/bb123786(v=exchg.65).aspx>

-[12] [CITE@en[RFC 4468: Message Submission BURL Extension]], [TIME[2023-12-02T07:36:27.000Z]], [TIME[2023-12-02T07:40:14.166Z]] <https://www.rfc-editor.org/rfc/rfc4468.html>
-[13] [CITE[RFC Errata Report » RFC Editor]], [TIME[2023-12-02T07:41:39.000Z]] <https://www.rfc-editor.org/errata/rfc4468>

[14] 
[CITE[Simple Mail Transfer Protocol (SMTP) Enhanced Status Codes Registry]], [TIME[2021-07-18T23:25:03.000Z]], [TIME[2023-12-02T07:42:01.098Z]] <https://www.iana.org/assignments/smtp-enhanced-status-codes/smtp-enhanced-status-codes.xhtml>

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