S/MIME Encryption in Apple Mail

If you have general questions about S/MIME encryption, you can find more information here.

Using S/MIME in Apple Mail is straightforward.

1. Simply double-click the previously exported .p12 file (certificate file).
   A dialog will open asking whether you want to add the file to the “Keychain".

2. Click “Add". The installation is now complete. After restarting Apple Mail, you can use S/MIME.

3. Test your configuration by sending yourself an encrypted email.
   Enter your own S/MIME-enabled email address.
   On the right side next to the signature selection, you will now see two new buttons:
   The right button (gear icon) signs the email.
   The left button (lock icon) encrypts it.

4. After sending yourself a signed and/or encrypted message, it will be displayed accordingly in your inbox once received.
   You can find the relevant information in the email header.