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Re: [ietf-smtp] [dmarc-ietf] RFC 7372 on Email Authentication Status Codes

2014-09-19 02:29:00
On Thu 18/Sep/2014 20:24:38 +0200 Christoph Kluge wrote:

But that isn’t the point.  The question is whether SMTP clients SHOULD also
expect a “policy code” in CONNECT and MAY act accordingly, and how this
is covered by said RFC.

Every upcoming authentication method has at some point considered the
need to color its rejections with its own reply code.  For an older
snippet on 550 vs 554, see:

   John C Klensin, [yam] Ambiguities in RFC 5321, 21 Nov 2009

My understanding is that SMTP reply codes serve to guide protocol
behavior rather than to ruminate deliverability statistics after the
fact.  The latter is confined to text strings, which may include
status codes.


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