Policy

Do not provide Continue option on Encryption warning dialog boxes

This setting controls whether Outlook users are allowed to send e-mail messages after they see an encryption warning. If you enable this policy setting, encryption warning dialog boxes do not contain a Continue button, which means that users must cancel the sending operation entirely. If you disable or do not configure this policy setting, if Outlook users see an encryption-related dialog box when attempting to send a message, they can choose to dismiss the warning and send the message anyway.

Policy
Pack Microsoft Office
Category Microsoft Outlook 2016 / Security / Cryptography
Policy ID a9980027ee83
Internal name L_DisableContinuebuttononallEncryptionwarningdialogs

Registry

Copy registry mappings

HKCU\software\policies\microsoft\office\16.0\outlook\security\disablecontinueencryption (enabled) = 1
HKCU\software\policies\microsoft\office\16.0\outlook\security\disablecontinueencryption (disabled) = 0

Policy notes

This setting controls whether Outlook users are allowed to send e-mail messages after they see an encryption warning. If you enable this policy setting, encryption warning dialog boxes do not contain a Continue button, which means that users must cancel the sending operation entirely. If you disable or do not configure this policy setting, if Outlook users see an encryption-related dialog box when attempting to send a message, they can choose to dismiss the warning and send the message anyway.

Related policies

Always use TNEF formatting in S/MIME messagesCheck for the user's private key when the user sends an encrypted email that includes the user as a recipientDo not check e-mail address against address of certificates being usedDo not display 'Publish to GAL' buttonEnable Cryptography IconsEnable Retrieval of Remote Certificate Authority InformationEncrypt all e-mail messages