dovecot - Oct 2020 - DKIM fail if WHM adds Message-ID, should be Message-Id

I created a client library to send emails for a webapp.

When the client library makes a connection to the SMTP server, and  
then do NOT add Message-Id header,  Message-ID (with a capital D)  
header is added, and the SMTP server adds a incorrect DKIM-Signature  
record 'h' part, invalidating the generated DKIM signature value.

This causes outlook, yahoo, gmail and other email recipients to add  
'dkim:fail' to the message which pushes it into junk/spam folder.

The work around is to add to the message a Message-Id with a  little  
?d? header.  Then the SMTP server processes the email with the correct  
DKIM-Signature, correct DKIM ?h? part and does not add a Message-ID  
header.

Message-ID fails DKIM, Message-Id is better by OzBob ? Pull Request  
#142 ? dovecot/core (github.com)
https://github.com/dovecot/core/pull/142

Regards
Robert

On 12 Oct 2020, at 02:51, webadmin at exalt.com.au
wrote:
> I created a client library to send emails for a webapp.
> 
> When the client library makes a connection to the SMTP server, and then do
NOT add Message-Id header,  Message-ID (with a capital D) header is added, and
the SMTP server adds a incorrect DKIM-Signature record 'h' part,
invalidating the generated DKIM signature value.
This I s not a dovecot issue I don't think, this is a configuration issue
with your MTA (exit, postfix, sendmail, et al).
> The work around is to add to the message a Message-Id with a  little ?d?
header.  Then the SMTP server processes the email with the correct
DKIM-Signature, correct DKIM ?h? part and does not add a Message-ID header.
This seems very very wrong as the headers in mail messages are not case
sensitive.

Also, I do not think dovecot adds message-id headers at all, and dovecot would
not be involved in sending mail.

-- 
Ah we're lonely, we're romantic / and the cider's laced with acid /
	and the Holy Spirit's crying, Where's the beef? / And the moon is
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	expectation of relief