In article <0762f9ada48c4c9eaef06e16a49a2...@bayviewphysicians.com> you write:
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>Does this scenario correctly characterize how organizations may be unable to 
>move past p=none with breaking things?

As far as I can made sense of it, no.

>a) A vendor application detects an event, looks up in a database for sender 
>name (client contact) and recipient list.
>
>b) The application connects to a mail server via IMAP, and sends the message 
>using something like application@vendordomain
>for the SMTP from and cllentcontact@clientdomain as the Message from.    The 
>client domain becomes especially important if
>the recipients are in a different domain than the client.   An example might 
>be an HVAC system operated by a vendor, on
>behalf of the building manager, which needs to communicate with the building 
>tenants. ...

Again, no. You're confusing submission with SMTP. I have a printer
that sends me e-mail when it's out of paper, which it does by sending
mail to my submission server, not directly to me.  If I were checking DMARC
on the messages, they would easily pass since the submission server adds
DKIM signatures.

>Then the client wants to implement DMARC
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>
>d) The client develops a list of all of its third-party mailers and tells the 
>third parties to begin applying the client's
>DKIM signature to their messages.   This adds a boatload of complexity to the 
>vendor's application, since he needs a
>different applied signature for each client.   It requires either major 
>changes to the application, a more sophisticated
>mail server, or a special box simply to sit in front of the mail server to 
>detect and apply the correct signature.  None of
>these seem like generic off-the-shelf solutions.   I would not know where to 
>buy that capability if I needed it today.

Again, no. I believe that devices that send mail do what they've
always done, send it to a submission server for further delivery. The
"special box" has been there all along.

R's,
John

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