Re: [apps-discuss] Feedback on draft-moonesamy-smtp-ipv6-00

S Moonesamy <sm+ietf@elandsys.com> Tue, 15 November 2011 08:09 UTC

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Date: Mon, 14 Nov 2011 20:46:25 -0800
To: John Levine <johnl@taugh.com>
From: S Moonesamy <sm+ietf@elandsys.com>
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Subject: Re: [apps-discuss] Feedback on draft-moonesamy-smtp-ipv6-00
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Hi John,
At 06:57 PM 11/14/2011, John Levine wrote:
>Looks mostly reasonable.

Thanks for the feedback.

>In step (9), you say "If a transient failure condition is reported,
>try the next MX RR" which looks wrong to me.  If you get a 4xx, you
>requeue the message and try it again later.

I agree that it looks wrong.  I was going to suggest "going to Step 
7" instead of Step 3.  The problem though is that you cannot retry 
against the same IP address in all cases as you have to take into 
account the DNS TTL.  The workaround I see is:

(9)  Attempt to deliver the email over the connection established, as
      specified in RFC 5321.  If a transient failure condition is
      reported, try again as defined in RFC 5321 Section 4.5.4.1.

Regards,
S. Moonesamy