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How do I make Thunderbird use my certificates stored in Kleopatra (KDE)? When I try to import certificates it says it's looking for PKCS12 files, but I can't find any. I'm not sure where Kleopatra stores keys, but I assume it takes them from gnupg's directory (~/.gnupg). So how do I make the two play together?

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Export your certificate and private key from Kleopatra (only PEM format supported). Convert the file to PKCS#12 format with the openssl pkcs12 command (find tutorials on Google). Import the result into Thunderbird's certificate manager.

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While you asked about Kleopatra specifically, since you mentioned GPG you might be interested in the Engimail addon for Thunderbird, which simplifies combining Thunderbird and GnuPG a lot.

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