Block send when web add-ins can't load
Supported on: At least Windows Server 2008 R2 or Windows 7
Registry
software\policies\microsoft\office\16.0\outlook\security Value name: onsendaddinswaitforload
Enabled: onsendaddinswaitforload = 1
Disabled: onsendaddinswaitforload = 0
Description
This policy setting allows you to control whether Outlook should block sending emails and meeting requests until web add-ins are loaded from Exchange. If you enable this policy setting, Outlook won’t allow emails and meeting requests to be sent until web add-ins are loaded from Exchange. If you disable or don’t configure this policy setting, Outlook will allow emails and meeting requests to be sent even if the latest web add-ins haven’t been loaded from Exchange yet. For more information about when to use this setting, see https://go.microsoft.com/fwlink/p/?linkid=2161562