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

Claus Assmann <ietf-smtp@esmtp.org> Wed, 16 June 2021 16:56 UTC

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Date: Wed, 16 Jun 2021 18:56:12 +0200
From: Claus Assmann <ietf-smtp@esmtp.org>
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Subject: Re: [ietf-smtp] sm8: bogus SMTPUTF8? (was: How is EAI mail implemented ?)
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On Wed, Jun 16, 2021, John Levine wrote:

> >> Huh.  Why does it set the UTF8 flag on MAIL FROM when sending ASCII messages?

> It was locally injected with "sendmail -fuser1@xn--5nq21jyu9d1ta.xn--5nqx41au4nqohsp3axcg.xn--fiqs8s atest@xn--fct.xn--5nqx41au4nqohsp3axcg.xn--fiqs8s"

I can't reproduce that - the sink does not receive an SMTPUTF8 argument:

EHLO seven.dev-lab.TLD
250-local.host ESMTP Hi there        
250-SMTPUTF8  
250-8BITMIME  
250 HELP  
MAIL From:<user1@xn--5nq21jyu9d1ta.xn--5nqx41au4nqohsp3axcg.xn--fiqs8s>  
250 Ok  
RCPT To:<atest@xn--fct.xn--5nqx41au4nqohsp3axcg.xn--fiqs8s>  
250 Ok  
DATA  

If SMTPUTF8 is not given during submission, then it will only be
added if one of the envelope addresses is rewritten to a non-ASCII
format during processing, e.g., using aliases -- it's easy to
see that in the code:
fgrep 'smtputf8 = true' *.[ch]
If you can provide all the required information to reproduce the
problem, please send it to the sendmail support address.

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