Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt> (A NULL MX Resource Record for Domains that Accept No Mail) to Proposed Standard
S Moonesamy <sm+ietf@elandsys.com> Sat, 19 July 2014 08:19 UTC
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Date: Sat, 19 Jul 2014 01:14:34 -0700
To: John Levine <johnl@taugh.com>, ietf@ietf.org
From: S Moonesamy <sm+ietf@elandsys.com>
Subject: Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt> (A NULL MX Resource Record for Domains that Accept No Mail) to Proposed Standard
In-Reply-To: <20140718144447.52290.qmail@joyce.lan>
References: <C5EE6366-7EFF-4B7C-BF09-9579C6D24393@nominum.com> <20140718144447.52290.qmail@joyce.lan>
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Hi John, At 07:44 18-07-2014, John Levine wrote: >Well, OK. What would be the proper MX for mail sent to ted@www.ietf.org ? That's a good question. I'll explain the problem as follows: (a) The user uses an incorrect email address for the recipient. (b) The mail service does not provide timely feedback about not being able to deliver the message (see (a)). The fix proposed is to signal that the mail target does not support a mail service. It's not a bad idea. Now, how do you (used in a general sense) do that? Currently, there isn't any way to do that because of the implicit MX. There was a fix proposed over nine years ago. It was to use a dot as the mail target. From an application point of view, what the dot means is a DNS problem. :-) From a SMTP point of view, the target host is not valid; the user will be sent a message in about four hours with information about the delivery status. The MX RDATA format, defined in an Internet Standard, is as follows: "A <domain-name> which specifies a host willing to act as a mail exchange for the owner name." There is a problem. The IETF can: (a) Solve it. (b) Pretend that it does not exist. (c) Wait. I do not have a strong opinion about all. Regards, S. Moonesamy
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… John C Klensin
- Re: [DNSOP] Last Call: <draft-ietf-appsawg-nullmx… Dave Crocker
- Re: [apps-discuss] Last Call: <draft-ietf-appsawg… Murray S. Kucherawy
- Re: [apps-discuss] Last Call: <draft-ietf-appsawg… John C Klensin
- Re: [DNSOP] Last Call: <draft-ietf-appsawg-nullmx… Mark Andrews
- Re: [DNSOP] Last Call: <draft-ietf-appsawg-nullmx… Sandy Wills
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Viktor Dukhovni
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Dave Crocker
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… John C Klensin
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Dave Crocker
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Mark Andrews
- Re: [DNSOP] Last Call: <draft-ietf-appsawg-nullmx… Murray S. Kucherawy
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… John Levine
- Re: [apps-discuss] Last Call: <draft-ietf-appsawg… Tony Finch
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Ted Lemon
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… John C Klensin
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Dave Crocker
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Tony Finch
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Ted Lemon
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… John Levine
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Dave Crocker
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Ted Lemon
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Ted Lemon
- Re: [apps-discuss] Last Call: <draft-ietf-appsawg… Nico Williams
- Re: [apps-discuss] Last Call: <draft-ietf-appsawg… Nico Williams
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Dave Crocker
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Ted Lemon
- Re: [apps-discuss] Last Call: <draft-ietf-appsawg… ned+ietf
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Hector Santos
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Hector Santos
- summary for Last Call: <draft-ietf-appsawg-nullmx… John Levine
- Re: summary for Last Call: <draft-ietf-appsawg-nu… ned+ietf
- Re: summary for Last Call: <draft-ietf-appsawg-nu… John R Levine
- Re: summary for Last Call: <draft-ietf-appsawg-nu… Dave Cridland
- Re: summary for Last Call: <draft-ietf-appsawg-nu… Tony Finch
- Re: summary for Last Call: <draft-ietf-appsawg-nu… John R Levine
- Re: summary for Last Call: <draft-ietf-appsawg-nu… ned+ietf
- Re: summary for Last Call: <draft-ietf-appsawg-nu… Tony Finch
- Re: summary for Last Call: <draft-ietf-appsawg-nu… ned+ietf
- Re: summary for Last Call: <draft-ietf-appsawg-nu… Tony Finch
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Mark Andrews
- Re: summary for Last Call: <draft-ietf-appsawg-nu… ned+ietf
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Viktor Dukhovni
- Re: summary for Last Call: <draft-ietf-appsawg-nu… Viktor Dukhovni
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Viktor Dukhovni
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… S Moonesamy
- Re: summary for Last Call: <draft-ietf-appsawg-nu… Tony Finch
- Re: [apps-discuss] Last Call: <draft-ietf-appsawg… Douglas Otis
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Viktor Dukhovni
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Dave Crocker
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… John R Levine
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Scott Kitterman
- Re: summary for Last Call: <draft-ietf-appsawg-nu… ned+ietf
- Re: [apps-discuss] Last Call: <draft-ietf-appsawg… John C Klensin
- Re: [apps-discuss] Last Call: <draft-ietf-appsawg… Nico Williams
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Ted Lemon
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Douglas Otis
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… Viktor Dukhovni
- Re: Last Call: <draft-ietf-appsawg-nullmx-05.txt>… John Levine
- Last Call conduct redux (Was: Last Call: <draft-i… Pete Resnick