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  4. Sign or encrypt a message

Sign or encrypt a message

To send a signed or encrypted email, you must use an email account that supports S/MIME-protected messages.
  1. In an email, above the 
    To
     field, tap The list icon.
  2. Tap a signing or an encryption option.
If your device is associated with a CRL or an OCSP server, when you add recipients to an encrypted message, your device tries to retrieve a certificate status for each recipient. You can't send the message until certificate statuses are received for all recipients. If certificates can't be found, the recipients' names appear in yellow. If certificates are invalid, the recipients' names appear in red.