Re: What breaks the validity of DKIM signature?

"Thomas Barth via users" <[email protected]> Mon, 22 Dec 2025 17:14:11 +0100
Newsgroups gmane.mail.spam.spamassassin.general
Message-ID <[email protected]>
Hi,

I have to assign a meaningless value to DMARC_REJECT

I ve got another example from a valid invoice mail

X-Spam-Status: Yes, score=5.013 tagged_above=1 required=5
  tests=[BAYES_00=-0.1, DKIM_INVALID=0.1, DKIM_SIGNED=0.1, 
DMARC_REJECT=1.797,


Authentication-Results: mx1.example1.de; dmarc=pass (p=reject dis=none) 
header.from=clickup.com
Authentication-Results: mx1.example1.de;
     dkim=pass (2048-bit key; unprotected) header.d=clickup.com 
[email protected] header.a=rsa-sha256 
header.s=64b6lygijhajl2ls7xgr6eyd2p6rymhy header.b=ocshj5Zy;
     dkim=pass (1024-bit key; unprotected) header.d=amazonses.com 
[email protected] header.a=rsa-sha256 
header.s=ihchhvubuqgjsxyuhssfvqohv7z3u4hn header.b=bL9Uf+91;
     dkim-atps=neutral
Received: from a3-29.smtp-out.eu-west-1.amazonses.com 
(a3-29.smtp-out.eu-west-1.amazonses.com [54.240.3.29])

The result of my dkim checker (Perl script with use Mail::DKIM::Verifier;)

cat testmails/mail-dkim-clickup.eml | ./scripts/check_dkim.pl
sig d=clickup.com s=64b6lygijhajl2ls7xgr6eyd2p6rymhy result=fail 
detail=fail (message has been altered)
sig d=amazonses.com s=ihchhvubuqgjsxyuhssfvqohv7z3u4hn result=fail 
detail=fail (message has been altered)
overall: fail

The only thing I notice is that lint issues a warning:

spamassassin --lint
Dec 22 16:49:21.731 [901837] warn: Use of uninitialized value $retries 
in numeric lt (<) at /usr/share/perl5/Mail/SpamAssassin/DnsResolver.pm 
line 1003.

Do you perhaps see a correlation here?

Best regards
Thomas B.