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How to send us S/MIME encrypted e-mail


If you are experienced with encrypted e-mail and allready know how to proceed, you can download and install the S/MIME certificate using this direct link to the Website of the German National Research and Education Network (DFN): 


Download and install S/MIME certificate at DFN


You can also follow this manual to install our S/MIME certificate:


Please, visit the website of the German National Research and Education Network (DFN) using this link:


Search for S/MIME certificates at DFN


Unfortunately, only German interface is available.


encrypted e-mail image

Search for the receiver’s e-mail address, for example:


You should see this screen:

encrypted e-mail image 2


Click on the (i) button next to the serial number. That should bring you to this screen:


encrypted e-mail image 3


Press the Download button and import the certificate in your keychain.


We assume you have your own S/MIME certificate and a current e-mail client installed that supports S/MIME.


Refer to your e-mail client’s documentation on how to enable encryption using S/MIME.



Installing the S/MIME certificate

Sending a digitally signed and/or encrypted email


Mail on Mac

Use of personal certificates

Sign or encrypt e-mails 



How to import and export certificates

How to send an encrypted message


If you have any questions, please contact: