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- NWG/RFC# 737 KLH 31 Oct 77 42217
- Network Working Group K. Harrenstien
- Request for Comments: 737 SRI-KL
- NIC: 42217 31 October 1977
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- FTP Extension: XSEN
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- This note describes an extension to the File Transfer Protocol which
- provides for "sending" a message to a logged-in user, as well as
- variants for mailing it normally whether the user is logged in or not.
-
- Several systems have a SEND command or program which sends a message
- directly to a user's terminal. On the SAIL (SU-AI) and ITS
- (MIT-(AI/ML/MC/DMS)) systems the concept has been broadened to allow
- SEND'ing to users on other network sites; to support this, three new FTP
- commands were added which have a syntax identical to the existing MAIL
- command. For reference, the latter is:
-
- MAIL <SP> <recipient name> <CRLF>
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- If accepted, returns 350 reply and considers all succeeding lines
- to be the message text, terminated by a line containing only a
- period, upon which a 256 completion reply is returned. Various
- errors are possible.
-
- The new commands, with their special replies, are:
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- XSEN -- Send to terminal.
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- Returns 453 failure reply if the addressee is refusing or not
- logged in.
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- XSEM -- Send, Mail if can't.
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- Returns 009 notification reply if message cannot be SENT.
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- XMAS -- Mail And Send. (couldn't resist this one)
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- No special replies.
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- Note that for XSEM and XMAS, it is the mailing which determines success,
- not the SENDing, although XSEM as implemented uses a 009 reply (in
- addition to the normal success/failure code) to indicate that because
- the SEND failed, an attempt is being made to mail the message instead.
- There are no corresponding variants for MLFL, since messages transmitted
- in this way are generally short, and neither I nor Brian Harvey
- (implementing respectively the ITS and SAIL servers) wanted to bother.
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