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Kmail: make your signed e-mails be recognized

Kmail (as in KDE 3.4) is not delivered with a base of recognized authorities' certificates.

Then, receiving a signed e-mail displays an alert message.

To declare authorities' certificates as 'trusted', you need to:
  1. import the certificate in the base of certificate of gpgsm
  2. complete the file ~/.gnupg/trustlist.txt with the SHA1 fingerprint of the certificate (1 per line)
Concrete example: let's import the root certificate Thawte Personal Freemail CA that is available here Root certificates (implemented on browsers). We need the certificate and its fingerprint.
$ gpgsm --import
gpgsm: NOTE: THIS IS A DEVELOPMENT VERSION!
gpgsm: It is only intended for test purposes and should NOT be
gpgsm: used in a production environment or with production keys!
gpgsm: keybox `/home/tag/.gnupg/pubring.kbx' created
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
gpgsm: total number processed: 1
gpgsm:               imported: 1

$ echo 209900B63D955728140CD13622D8C687A4EB0085 >> ~/.gnupg/trustlist.txt
With the Kleopatra tool you will be able to visualize clearly all certificates.

In our testing machine, with Kde 3.4, you have to tick the box "never consult a CRL" in Kmail Configuration / Validation S/MIME.

The CRL manager does not work, it is not clear why.

Same CRL issue in KDE 3.5