Information
This policy setting controls whether Outlook users can publish e-mail certificates to the Global Address List (GAL). The GAL contains information for all email users, distribution groups, and Exchange resources.
The recommended state for this setting is: Enabled.
Rationale:
Only Administrators should be able to perform tasks such as publishing digital certificates to the GAL.
Impact:
Only Administrators will be able to publish a new or updated certificate to the GAL.
Solution
To establish the recommended configuration via GP, set the following UI path to Enabled:
User Configuration\Administrative Templates\Microsoft Outlook 2016\Security\Cryptography\Do not display 'Publish to GAL' button
Default Value:
Disabled. (Outlook users can publish their e-mail certificates to the GAL through the 'E-mail Security' section of the Trust Center.)