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

[@lbutlr]

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.

-- 
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