Install S/MIME email encryption certificate on macOS (Apple Mail)

Step 1: Install certificate files

Open and install all the certificate files you received. Before installing your private certificate, you will need to enter the installation password.

 

Step 2: Restart Apple Mail

After successfully installing all certificate files, restart Apple Mail

 

Step 3: Sending encrypted email

After restarting Apple Mail you will see two new icons when composing an email.

  • The lock icon denotes an encrypted email. This message is encrypted with the recipient’s public key and can only decrypted using his private key.
  • The right icon denotes a signed email. This means that your own public certificate will be attached and the recipient can use it to send you an encrypted email.

Both options should be enabled.