[ietf-smtp] SMTP Reply code 500

Geethapriya Liyanage <g.liyanage@gmail.com> Wed, 04 March 2020 03:00 UTC

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From: Geethapriya Liyanage <g.liyanage@gmail.com>
To: ietf-smtp <ietf-smtp@ietf.org>
Date: Wed, 04 Mar 2020 08:30:45 +0530
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Subject: [ietf-smtp] SMTP Reply code 500
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Hello,

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,
Geethapriya