Specify contact email address or Email ID
Supported on: At least Windows Server 2016, Windows 10 Version 1709
Registry
HKLM
SOFTWARE\Policies\Microsoft\Windows Defender Security Center\Enterprise Customization Options
Email text Description
Specify the email address or email ID that will be displayed in Windows Security and associated notifications. Users can click on the contact information to create an email that will be sent to the specified address. The default email application will be used. Enabled: Enter the email address or email ID in the Options section. Disabled: A contact email address or email ID will not be shown in either Windows Security or any notifications it creates. Not configured: Same as Disabled.