Re: [ietf-smtp] EHLO domain validation requirement in RFC 5321

Keith Moore <moore@network-heretics.com> Sun, 04 October 2020 18:39 UTC

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To: dcrocker@bbiw.net
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References: <20200928221602.046CE22A35B3@ary.qy> <ADA8052C-2B7D-4C50-8FFF-A3D88EC3BA58@isc.org> <ab8886ec-79b1-a89c-da38-dfe5a6e681@taugh.com> <a692482a-7777-5743-0820-894dbe7314b0@network-heretics.com> <1c1856a5-ae46-48a0-84cd-66eafb543fa9@gulbrandsen.priv.no> <af67c913-c5fe-9410-3298-b38a208153c6@network-heretics.com> <42cd611c-2db5-53a1-8363-64a6d14e16de@dcrocker.net> <f6123ad6-c4cc-b4f4-83a5-53ebcf987c53@network-heretics.com> <3620f0c3-c765-ce55-4eaf-d096acf0e0e6@dcrocker.net>
From: Keith Moore <moore@network-heretics.com>
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Date: Sun, 4 Oct 2020 14:39:27 -0400
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Subject: Re: [ietf-smtp] EHLO domain validation requirement in RFC 5321
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On 10/4/20 2:35 PM, Dave Crocker wrote:

> On 10/4/2020 11:28 AM, Keith Moore wrote:
>> On 10/4/20 2:19 PM, Dave Crocker wrote:
>> It's easy to find documentation about how highways are engineered to 
>> permit safe operation at certain speeds (slightly greater than 
>> statutory speed limits), also taking into account road conditions, 
>> traffic volume, etc.   The "expectation" you refer to is not merely 
>> an informal convention, it's a result of explicit design.
>
> Actually, it has little or nothing to do with road engineering. 
> Objectively, in fact, anything over about 55 mph is extremely unsafe, 
> given typical human reaction behaviors, at the list.
>
> So this is primarily a matter of operating convention by the folk who 
> police the roads.  Unwritten but highly reliable.  Except when it isn't.

Whatever.  I found reliable sources that stated otherwise.   But this 
just illustrates that jumping through hoops that you hold up is pointless.


Keith