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It is important that you retain the expired S/MIME certificate with the corresponding private key. Thus, all e-mails encrypted with this S/MIME certificate and the corresponding private key remain readable for you.
If the expired S/MIME certificate or the corresponding private key is deleted, you can no longer read all e-mails encrypted with this certificate in plain text.
If you have any further questions, please contact our support team on +49 661 480 276 10.