Message Formats

Supported on: At least Windows Server 2008 R2 or Windows 7

Registry

HKCU software\policies\microsoft\office\16.0\outlook\security

Options

msgformats enum
  • S/MIME -> 1
  • Exchange -> 2
  • Fortezza -> 20
  • S/MIME and Exchange -> 3
  • S/MIME and Fortezza -> 21
  • Exchange and Fortezza -> 22
  • S/MIME, Exchange, and Fortezza -> 23

Description

This policy setting controls which message encryption formats Outlook can use. Outlook supports three formats for encrypting and signing messages: S/MIME, Exchange, and Fortezza. If you enable this policy setting, you can specify whether Outlook can use S/MIME (the default), Exchange, or Fortezza encryption, or any combination of any of these options. Users will not be able to change this configuration. If you disable or do not configure this policy setting, Outlook only uses S/MIME to encrypt and sign messages. If you disable this policy setting, users will not be able to change this configuration.