Re: sm8: bogus SMTPUTF8? (was: How is EAI mail implemented ?)

It appears that Claus Assmann  <[email protected]> said:
>On Wed, Jun 16, 2021, John Levine wrote:
>
>> It was locally injected with "sendmail [email protected] [email protected]"
>
>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:

=====
Return-Path: <[email protected]>
Received: from xn--5nq21jyu9d1ta.xn--5nqx41au4nqohsp3axcg.xn--fiqs8s ([IPV6:2606:4300:0:4::1003])
  by mail1.iecc.com ([IPV6:2001:470:1f07:1126:33:5370:616d:6d31])
  with UTF8SMTPS via TCP6 (port 22912/25) id 678041815
  tls TLS1_3_ECDHE_RSA_AES_256_GCM_AEAD; 16 Jun 2021 21:12:44 -0000
Received: from xn--5nq21jyu9d1ta.xn--5nqx41au4nqohsp3axcg.xn--fiqs8s (localhost [127.0.0.1])
    by xn--5nq21jyu9d1ta.xn--5nqx41au4nqohsp3axcg.xn--fiqs8s (8.17.0.2/8.16.1) with UTF8SMTPS id 15GLChW5086678
    (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO)
    for <[email protected]>; Wed, 16 Jun 2021 21:12:43 GMT
    (envelope-from [email protected])
Received: (from johnl@localhost)
    by xn--5nq21jyu9d1ta.xn--5nqx41au4nqohsp3axcg.xn--fiqs8s (8.17.0.2/8.16.1/Submit) id 15GLChpK086677
    for [email protected]; Wed, 16 Jun 2021 21:12:43 GMT
    (envelope-from johnl)
Date: Wed, 16 Jun 2021 21:12:43 GMT
From: John L <[email protected]>
Message-Id: <202106162112.15GLChpK086677@xn--5nq21jyu9d1ta.xn--5nqx41au4nqohsp3axcg.xn--fiqs8s>
To: [email protected]
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