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Re: [ietf-smtp] Possible cont4ibution to moving forward with RFC5321bis SMTP

Keith Moore <moore@network-heretics.com> Thu, 02 January 2020 19:34 UTC

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To: dcrocker@bbiw.net, ietf-smtp@ietf.org
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From: Keith Moore <moore@network-heretics.com>
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Date: Thu, 02 Jan 2020 14:34:12 -0500
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Subject: Re: [ietf-smtp] Possible cont4ibution to moving forward with RFC5321bis SMTP
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On 1/2/20 2:08 PM, Dave Crocker wrote:

>> I mean a server that accepts incoming mail on behalf of a mail 
>> domain.  Normally they are advertised using MX records.  Sorry if 
>> that wasn't clear; I thought "MX server" would be an unambiguous 
>> shorthand.
>>
>> To me the point at which a message crosses a boundary between mail 
>> domains
>>
>
> ahh.  ack.
>
> You meant something like: "the sequence of hops starting with the MSA 
> and ending with the receiving MTA at the destination site".

Actually I was trying to focus on the single hop between the last MTA of 
an originating domain and the first MTA of the destination domain.

> I'd misunderstood and thought you meant that the MSA interacted 
> directly with the receiving MTA. 

That is possible (and in some cases desirable IMO).   But it's neither 
required, nor what I understand to be typical of today's operations.

(At the same time I question the assumption that all uses of IP address 
literals in EHLO can reasonably be confined to submissions.)

Keith

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