Integration in Thunderbird

Step 1: Open Thunderbird and call up the settings

[Translate to English:] Screenshot Einstellungen Aufrufen

If the menu bar is not displayed, press the "Alt key". Then call up the entry Options from the menu item Settings.


Step 2: Call up the certificate menu

[Translate to English:] Screenshot Zertifikatmenü

Go through the menu item Advanced and click on the button Certificates in the certificate manager.


Step 3: Import the user certificate

[Translate to English:] Screenshot Zertifikate importieren

On the Certificate Manager screen click "Your certificates" to import your personal user certificate.


[Translate to English:] Screenshot Zertifikat auswählen

Now select the user certificate you have saved.


[Translate to English:] Screenshot Passworteingabe

Enter the password you selected when exporting your user certificate, then OK.


[Translate to English:] Screenshot Import erfolgreich

Now your user certificate should be successfully imported.


[Translate to English:] Screenshot Menü Kontoeinstellungen öffnen

If necessary, press the "Alt key" again and select "Options" and then "Account settings"


[Translate to English:] Screenshot Kontoeinstellungen E-Mail Adresse

Please check that the e-mail address of your Thunderbird account matches the one you specified in the certificate request. The upper- and lower case letters must also match the information in the certificate.


Step 5: Activate and assign your user certificate

[Translate to English:] Screenshot S/MIME-Sicherheit

Now select the sub-item "S/MIME Security".

In the section "Digital signing", over the button "Select", choose your user certificate and Thunderbird will automatically enable it. 

[Translate to English:] Screenshot Zertifikat bestätigen

Confirm the incoming message with Yes.


[Translate to English:] Sreenshot Button Nachrichten digital unterschreiben

Your user certificate is now successfully deposited in Thunderbird. We recommend checking the box "Digitally sign messages (by default)" so that all of your outgoing mail will be automatically cryptographically signed.

Confirm and close the settings with "OK".

Step 6: Encryption when composing an e-mail

[Translate to English:] Screenshot Verschlüsseln einer E-Mail

With the menu item "S / MIME", you now have the ability to encrypt the emails that you compose. Please note, however, that you can only encrypt e-mails if you have already received a signed e-mail from all recipients of the e-mail you want to encrypt.


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