On 4/14/2022 1:27 PM, John Levine via mailop wrote:
Is anyone aware of any mail system that implements Delivered-To
the way this document describes,

Your query, to this list arrived at my inbox with these header fields:

Return-Path: <mailop-boun...@mailop.org>
Delivered-To: d...@dcrocker.net
Received: from mx.mailop.org (mx.mailop.org [91.132.147.157])
        by gcp-europe-west4-b-smtpin5.hostinger.io (mx.hostinger.com) with 
ESMTPS id 4KfWJZ1H9Sz9v9X5
        for <d...@dcrocker.net>; Thu, 14 Apr 2022 20:29:02 +0000 (UTC)
...> Date: 14 Apr 2022 16:27:53 -0400
Message-Id: <20220414202755.aee5f3dac...@ary.qy>
To: mailop@mailop.org
In-Reply-To: <eb44c0a6-8ebb-70f2-e211-4be7e6361...@dcrocker.net>
Organization: Taughannock Networks
...
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From: John Levine via mailop <mailop@mailop.org>
Reply-To: John Levine <jo...@taugh.com>


if that does not conform to the RFC's specification, please explain how.


rather than for loop breaking
with a token that looks like a mailbox but isn't?

Since there has been no claim or expectation that the field already has deployed use beyond loop-detection and, in fact, the RFC explicit states that that larger role is one of the reasons it was issued as Experimental, your query is a bit odd.



d/
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