Can I communicate in an encrypted way with a conversational partner who does not have an S/MIME certificate?

Unfortunately, this is not possible.

For secure and encrypted e-mail traffic, sender and recipient each require a public key to encrypt and decrypt the e-mail.

If only the sender has a public key, he can still sign his e-mails and thus uniquely identify himself.

For further questions, please contact our support team at the phone number +49 661 480 276 10.