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[ietf-smtp] SMTP Reply code 500

2020-03-03 21:01:05

In SMTP communication, normally SMTP client sends commands and SMTP
server replies to that with reply codes.  As in RFC 5321 , section
4.2.4, if the command is not recognized, code 500 should be returned.
My doubt is, if the SMTP server sends unrecognized command or code to
SMTP client , will the client also replies the same 500 code.  if not,
how the SMTP client should handle it.

Thank you,
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