From the email profile, you can enable S/MIME so that iOS and Android device users can choose to extend email security. S/MIME provides a standard method of encrypting and signing email messages. When using a work email account that supports S/MIME-protected messages, users can specify whether to use S/MIME to encrypt, sign, or encrypt and sign work email messages. Note that S/MIME cannot be enabled for personal email accounts.

S/MIME settings take precedence over PGP settings. When S/MIME support is set to "Required," PGP settings are ignored.