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Re: [ietf-smtp] sm8: bogus SMTPUTF8? (was: How is EAI mail implemented ?)

John Levine <johnl@taugh.com> Wed, 16 June 2021 21:17 UTC

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Date: Wed, 16 Jun 2021 17:17:17 -0400
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From: John Levine <johnl@taugh.com>
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Subject: Re: [ietf-smtp] sm8: bogus SMTPUTF8? (was: How is EAI mail implemented ?)
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It appears that Claus Assmann  <ietf-smtp@ietf.org> said:
>On Wed, Jun 16, 2021, John Levine wrote:
>
>> It was locally injected with "sendmail -fuser1@xn--5nq21jyu9d1ta.xn--5nqx41au4nqohsp3axcg.xn--fiqs8s atest@xn--fct.xn--5nqx41au4nqohsp3axcg.xn--fiqs8s"
>
>Do you still have that "shim" (mentioned in a usenet posting)?

Good thinking, but I got rid of the shim, typed a test message with the Mail command, same result:

=====
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From: John L <johnl@xn--5nq21jyu9d1ta.xn--5nqx41au4nqohsp3axcg.xn--fiqs8s>
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To: johnl@iecc.com
Subject: a boring little message

bye
=====

Perhaps the A-labels in the domain name are confusing it?

In any event, I think you will find that expecting the users to tell
you when a message needs EAI handling rather than figuring it out when
it does the submission cleanup will cause endless pain. Neither
postfix nor exim have anything like the -U flag.

R's,
John

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