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Re: [ietf-smtp] [dispatch] Forced SMTP redirects

John Levine <johnl@taugh.com> Thu, 18 March 2021 00:32 UTC

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Date: Wed, 17 Mar 2021 20:32:33 -0400
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From: John Levine <johnl@taugh.com>
To: ietf-smtp@ietf.org
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Subject: Re: [ietf-smtp] [dispatch] Forced SMTP redirects
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It appears that Viktor Dukhovni  <ietf-smtp@ietf.org> said:
>Postfix has been around since 1997 (alpha), or if you prefer 2001 (1.0 prod).
>The SMTP client in Postfix only ever[1] looks at the first digit.  I expect this
>is fairly common.  There isn't yet any known response code where we'd expect
>the rest to matter.  I'd prefer to keep it that way.  The remaining digits are
>useful for forensics.

qmail which is about as old as postfix looks for 250 and 220 after
EHLO/HELO and STARTTLS but otherwise only looks at the first digit.

I'd flip it around.  Do we have examples of MTAs that look at the other digits
in responses to MAIL, RCPT, or DATA comands?

R's,
John

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