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: <[email protected]>
Delivered-To: [email protected]
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 <[email protected]>; Thu, 14 Apr 2022 20:29:02 +0000 (UTC)
...> Date: 14 Apr 2022 16:27:53 -0400
Message-Id: <[email protected]>
To: [email protected]
In-Reply-To: <[email protected]>
Organization: Taughannock Networks
...
List-Id: For mail operators <mailop.mailop.org>
List-Unsubscribe: <https://list.mailop.org/options/mailop>,
 <mailto:[email protected]?subject=unsubscribe>
List-Archive: <https://list.mailop.org/private/mailop/>
List-Post: <mailto:[email protected]>
List-Help: <mailto:[email protected]?subject=help>
List-Subscribe: <https://list.mailop.org/listinfo/mailop>,
 <mailto:[email protected]?subject=subscribe>
From: John Levine via mailop <[email protected]>
Reply-To: John Levine <[email protected]>


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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