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S/MIME for Apple Mail, The Right Way (DigiCert Version)

Install it on macOS:

  • Download cert bundle (.p7b) or individual certs (zipped) from DigiCert
  • Double click to install them on macOS Keychain Access

Install it on iOS:

  • Open Keychain Access, select category My Certificates
  • Right click and choose Export, select format .p12 (Make sure to export your cert into .p12, this will contain private key for iOS to send encrypted emails)
  • Email it with your individual certs (root CAs from DigiCert) and install them on iOS
  • Select this cert under email account settings