Can you say why do you drop Mime-Version header? This should never be done! You can without issues drop some received header, but your regex is bad.
On Sat, 10 May 2025, 20:33 Ken Biggs via Postfix-users, < postfix-users@postfix.org> wrote: > So continuing the saga ... digging into /etc/postfix/header_checks I found > a revision I made back in January to try to keep our outgoing email from > having headers with the IP address of the email client that sent the email > to the server and maybe keep Gmail from marking our outgoing email as SPAM. > > /^Received:.*with ESMTPSA/ IGNORE > /^X-Originating-IP:/ IGNORE > /^X-Mailer:/ IGNORE > /^Mime-Version:/ IGNORE > > If I comment that out and add > > mime_header_checks = regexp:/etc/postfix/header_checks > header_checks = regexp:/etc/postfix/header_checks > > back into main.cf DKIM still appears to work properly. So, looks like I > probably broke it back in January. Gack ... apparently I didn't test that > revision correctly and it was rewriting incoming email headers. > > -Ken > > > On May 10, 2025, at 1:06 PM, Scott Kitterman via Postfix-users < > postfix-users@postfix.org> wrote: > > > > > > > > On May 10, 2025 5:57:34 PM UTC, Dan Mahoney via Postfix-users < > postfix-users@postfix.org> wrote: > >> Mime-version was listed as a signed header but was absent. > >> > >> I suspect his header checks cleaned that out. > >> > >> Note that having a header listed in the H equals list, but having that > header be absent is legal, but I don’t know why the signing software would > say it’s signing that header when it’s not there. > >> > > > > Generically (probably not relevant here), 'signing' a non-existent > header field will cause the signature verification to fail if one is later > added. There may be times when that's desirable. > > > > Scott K > > _______________________________________________ > > Postfix-users mailing list -- postfix-users@postfix.org > > To unsubscribe send an email to postfix-users-le...@postfix.org > > _______________________________________________ > Postfix-users mailing list -- postfix-users@postfix.org > To unsubscribe send an email to postfix-users-le...@postfix.org >
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