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Change your signing or encryption certificate

Your BlackBerry® device uses your encryption certificate to encrypt messages in the Sent Items folder and includes your encryption certificate in messages that you send so that recipients can encrypt their reply messages.
  1. On the Home screen or in a folder, click the Options icon.
  2. Click Security > S/MIME.
  3. In the Signing section or the Encryption section, change the Certificate field.
  4. Press the Menu key > Save.

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