Re: [Jmap] AD review of draft-ietf-jmap-mdn-13

Bron Gondwana <brong@fastmailteam.com> Fri, 24 July 2020 04:42 UTC

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Date: Fri, 24 Jul 2020 14:42:26 +1000
From: Bron Gondwana <brong@fastmailteam.com>
To: jmap@ietf.org
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Subject: Re: [Jmap] AD review of draft-ietf-jmap-mdn-13
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On Fri, Jul 24, 2020, at 14:34, Barry Leiba wrote:
> 
> — Section 4.2.1 —
> 
>    Description: The message has the "$mdnsent" keyword already set.  The
>    client MUST NOT try again to send an MDN for this message.
> 
> This contradicts Section 2.1, which says this:
> 
>    The client SHOULD NOT issue an MDN/send request if the message has
>    the "$mdnsent" keyword set.

The way I read this is "there's a race condition here and your client may not have done an immediate fetch to know if it's already happened, but if it's told that there was a $mdnsent flag then it MUST not keep trying".

So it SHOULD check the keywords in advance (ideally with a recent refresh) but that's not as important as not retrying infinitely.

Bron.

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  Bron Gondwana, CEO, Fastmail Pty Ltd
  brong@fastmailteam.com