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- Network Working Group R. Nelson
- Request for Comments: 1957 Crynwr Software
- Updates: 1939 June 1996
- Category: Informational
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- Some Observations on Implementations
- of the Post Office Protocol (POP3)
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- Status of this Memo
-
- This memo provides information for the Internet community. This memo
- does not specify an Internet standard of any kind. Distribution of
- this memo is unlimited.
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- Observations
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- Sometimes an implementation is mistaken for a standard. POP3 servers
- and clients are no exception. The widely-used UCB POP3 server,
- popper, which has been further developed by Qualcomm, always has
- additional information following the status indicator. So, the
- status indicator always has a space following it. Two POP3 clients
- have been observed to expect that space, and fail when it has not
- been found. The RFC does not require the space, hence this memo.
- These clients are the freely copyable Unix "popclient" and the
- proprietary "netApp Systems Internet Series". The authors of both of
- these have been contacted, and new releases will not expect the
- space, but old versions should be supported.
-
- In addition, two popular clients require optional parts of the RFC.
- Netscape requires UIDL, and Eudora requires TOP.
-
- The optional APOP authentication command has not achieved wide
- penetration yet. Newer versions of the Qualcomm POP server implement
- it. Known client implementations of APOP include GNU Emacs VM client
- and Eudora Lite and Eudora Pro.
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- Security Considerations
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- Security issues are not discussed in this memo.
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- References
-
- [1] Myers, J., and M. Rose, "Post Office Protocol - Version 3",
- STD 53, RFC 1939, May 1996.
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- Nelson Informational [Page 1]
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- RFC 1957 Notes on POP3 Implementations June 1996
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- Author's Address
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- Russell Nelson
- Crynwr Software
- 521 Pleasant Valley Rd.
- Potsdam, NY 13676
-
- Phone: +1.315.268.1925
- FAX: +1.315.268.9201
- EMail: nelson@crynwr.com
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- Nelson Informational [Page 2]
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