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Re: New Issue: NOOP clarification

2007-11-29 13:08:08
On Thu, 29 Nov 2007 13:38:50 EST, Hector Santos said:

    For example, a command such as NOOP, whose successful execution does
    not offer the SMTP client any new information, will return a 250
    reply.  The reply is 502 when the command requests an unimplemented
    non-site-specific action.  A refinement of that is the 504 reply for
    a command that is implemented, but that requests an unimplemented

Note that a *valid* 421 due to a server shutdown or similar incident *does*
offer the SMTP client new information - the fact that a shutdown or temporary
issue has commenced.  So the "will return a 250" only matters if the
server *doesn't* have anything new to say - but it's totally free to signal
a new condition via a 421 or similar.

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