[kmail2] [Bug 323168] GPG signature validation fails due to KMail modifying headers within received mails

[Andre Heinecke via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=323168

--- Comment #16 from Andre Heinecke <aheinecke at intevation.de> ---
Created attachment 96444
  --> https://bugs.kde.org/attachment.cgi?id=96444&action=edit
Valid signature of example mail

The error message is indeed horrible. Afaik it's intended to mean "GnuPG does
not know whether or not it should trust the certificate so "Not enough
information"".

You can get some more details from the Audit Log. My best bet would be though
that you do not have the root certificate of the certificate chain for
jp-bank.japanpost.jp marked as a trusted issuer. You can do that by adding the
fingerprint to ~/.gnupg/trustlist.txt and restart the dirmngr service / gpgsm.

In Kleopatra this certificate would be shown in Other Certificates. There you
can also use "Trust root certificate" by right clicking the root certificate.
It should then show up under Trusted certificates.

Only messages that are signed by a certificate in the Trusted Certificates
group show up as Green in KMail.

Attached is a screenshot showing that KMail generally can verify that mail
correctly. I think this bug can be closed. Maybe a different bug for Kleopatra
/ S/MIME usability ;-)

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