DTOO260 - Message formats must be set to use SMime.

Information

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.

Solution

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2016 -> Security -> Cryptography 'Message Formats' to 'Enabled (S\MIME)'.

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_Outlook_2016_V2R3_STIG.zip

Item Details

Category: IDENTIFICATION AND AUTHENTICATION

References: 800-53|IA-7, CAT|II, CCI|CCI-000803, Rule-ID|SV-228453r508021_rule, STIG-ID|DTOO260, STIG-Legacy|SV-85851, STIG-Legacy|V-71227, Vuln-ID|V-228453

Plugin: Windows

Control ID: b6cee30f53a267e91071537af1fabe79a4f0d48086d76eda1d12c7d08b6345a4