Sensitive information such as social security numbers, passwords, login credentials and bank account numbers are vulnerable when sent via email. Set the policy value for User Configuration > Administrative Templates > Microsoft Outlook 2016 > Security > Cryptography > Signature Warning to "Enabled" "Always warn about invalid signatures".Email encryption is the process of disguising the content of your email messages to protect them from being read by unwanted parties. If the value for warnaboutinvalid is set to REG_DWORD = 1, this is not a finding. HKCU\software\policies\microsoft\office\16.0\outlook\security Use the Windows Registry to navigate to the following key: Verify the policy value for User Configuration > Administrative Templates > Microsoft Outlook 2016 > Security > Cryptography > Signature Warning is set to "Enabled" "Always warn about invalid signatures". Microsoft Office 365 ProPlus Security Technical Implementation Guideĭetails Check Text ( C-25030r442290_chk ) Users can decide whether they want to be warned about invalid signatures in the future. If you disable or do not configure this policy setting, if users open e-mail messages that include invalid digital signatures, Outlook displays a warning dialog. This option enforces the default configuration. Let user decide if they want to be warned. If you enable this policy setting, you can choose from three options for controlling how Outlook users are warned about invalid signatures: This policy setting controls how Outlook warns users about messages with invalid digital signatures.
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