[GLLUG] British Gas DKIM failure?

[Henrik Morsing]

On Fri, Jan 12, 2024 at 04:20:34PM +0000, Marco van Beek via GLLUG wrote:
>Hi,
>
>I suggest grepping your logs for "2F7612233E" as that should pull up 
>all the the info related to that email from the point Postfix accepts 
>the connection until it closes, and see if that tells you some more.
>
>Regards,
>
>Marco

Hi Marco,

This is what I see:

Dec 22 12:37:12 emil postfix/smtpd[3996527]: 2F7612233E: client=o94.p12.mailjet.com[87.253.237.94]
Dec 22 12:37:12 emil postfix/cleanup[3996586]: 2F7612233E: message-id=<296f63a1.CAAABPhWdncAAAAAAAAAAKg7aSYAAYCqUv4AAAAAABBDggBlhYBF at mailjet.com>
Dec 22 12:37:12 emil opendkim[768]: 2F7612233E: o94.p12.mailjet.com [87.253.237.94] not internal
Dec 22 12:37:12 emil opendkim[768]: 2F7612233E: not authenticated
Dec 22 12:37:12 emil opendkim[768]: 2F7612233E: s=mailjet d=britishgas.co.uk a=rsa-sha256 SSL error:04091068:rsa routines:int_rsa_verify:bad signature
Dec 22 12:37:12 emil opendkim[768]: 2F7612233E: bad signature data
Dec 22 12:37:13 emil opendmarc[3858740]: 2F7612233E: britishgas.co.uk fail
Dec 22 12:37:13 emil postfix/cleanup[3996586]: 2F7612233E: milter-reject: END-OF-MESSAGE from o94.p12.mailjet.com[87.253.237.94]: 5.7.1 rejected by DMARC policy for britishgas.co.uk; from=<296f63a1.CAAABPhWdncAAAAAAAAAAKg7aSYAAYCqUv4AAAAAABBDggBlhYBF at a1065858.bnc3.mailjet.com> to=<morsing at morsing.cc> proto=ESMTP helo=<o94.p12.mailjet.com>



Regards,
Henrik Morsing