在开发 IMAP 客户端时需要考虑哪些 RFC？

Question

理论上，Request For Comments (RFC) 集包含开发人员构建 IMAP 客户端所需了解的所有内容。但是，要知道哪些 RFC 需要考虑以及哪些可以忽略并不总是那么容易。

有没有人有一个 RFC 路线图来指导开发人员完成这个？通过 RFC 路线图，我的意思是：

• 需要的 RFC 的完整列表 被阅读和理解，以便 开发 IMAP 客户端。
• 指示哪些 RFC 不再 需要考虑，因为他们 已被取代。
• 相关 RFC 的摘要。
• 有关如何相关 RFC 的详细信息 相互关联。
• 逻辑顺序的指示 阅读并理解相关的 RFC。

Answer 1

路线图相当短。从 IMAP 4rev1 RFC RFC 3501 开始。它有一个Normative References 附录，列出了它直接依赖的所有 RFC，并在文档的适当位置引用了这些 RFC。

真正重要的——您可以按此顺序阅读它们——是 Internet 消息格式（我建议使用RFC 5322 而不是 RFC 2822 来更新）、MIME RFC (@987654324 @、2046 和 2047)、Content-Disposition (RFC 2183)、TLS (RFC 2595) 和 UTF-7 (RFC 2152) 来处理非 ASCII 文件夹名称。

完成基线协议后，您将需要开始研究扩展。其中一些将使您的生活更轻松......当服务器也提供支持时。你肯定会想要 IDLE (RFC 2177) 和 UIDPLUS (RFC 4315)。 SORT (RFC 5256) 也是一个不错的选择，NAMESPACE (RFC 2342) 可能很有用。您可能还需要处理一些额外的 SASL 身份验证机制，因此请从 RFC 1731 开始，并根据需要从那里开始。

这是附录 A 中的文字：

The following documents contain definitions or specifications that
are necessary to understand this document properly:

[ABNF]                Crocker, D. and P. Overell, "Augmented BNF for
                      Syntax Specifications: ABNF", RFC 2234,
                      November 1997.

[ANONYMOUS]           Newman, C., "Anonymous SASL Mechanism", RFC
                      2245, November 1997. 

[CHARSET]             Freed, N. and J. Postel, "IANA Character Set
                      Registration Procedures", RFC 2978, October
                      2000.

[DIGEST-MD5]          Leach, P. and C. Newman, "Using Digest
                      Authentication as a SASL Mechanism", RFC 2831,
                      May 2000.

[DISPOSITION]         Troost, R., Dorner, S. and K. Moore,
                      "Communicating Presentation Information in
                      Internet Messages: The Content-Disposition
                      Header", RFC 2183, August 1997.

[IMAP-TLS]            Newman, C., "Using TLS with IMAP, POP3 and
                      ACAP", RFC 2595, June 1999.

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

[LANGUAGE-TAGS]       Alvestrand, H., "Tags for the Identification of
                      Languages", BCP 47, RFC 3066, January 2001.

[LOCATION]            Palme, J., Hopmann, A. and N. Shelness, "MIME
                      Encapsulation of Aggregate Documents, such as
                      HTML (MHTML)", RFC 2557, March 1999.

[MD5]                 Myers, J. and M. Rose, "The Content-MD5 Header
                      Field", RFC 1864, October 1995.

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

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

[MIME-IMT]            Freed, N. and N. Borenstein, "MIME
                      (Multipurpose Internet Mail Extensions) Part
                      Two: Media Types", RFC 2046, November 1996.

[RFC-2822]            Resnick, P., "Internet Message Format", RFC
                      2822, April 2001.

[SASL]                Myers, J., "Simple Authentication and Security
                      Layer (SASL)", RFC 2222, October 1997.

[TLS]                 Dierks, T. and C. Allen, "The TLS Protocol
                      Version 1.0", RFC 2246, January 1999.

[UTF-7]               Goldsmith, D. and M. Davis, "UTF-7: A Mail-Safe
                      Transformation Format of Unicode", RFC 2152,
                      May 1997.

The following documents describe quality-of-implementation issues
that should be carefully considered when implementing this protocol:

[IMAP-IMPLEMENTATION] Leiba, B., "IMAP Implementation
                      Recommendations", RFC 2683, September 1999.

[IMAP-MULTIACCESS]    Gahrns, M., "IMAP4 Multi-Accessed Mailbox
                      Practice", RFC 2180, July 1997.