When your users create a Google Calendar event that includes one or more guests from outside of your domain, they are prompted to confirm whether it’s OK to include external guests in the event invitation. The default is to display the prompt, but as an administrator you can disable the prompt for your domain or for organizational units within your domain. For example, you may want to disable the prompt for an organizational unit that has frequent contact with guests outside your domain.
Follow these steps to enable or disable the external Calendar invitation prompt:
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Sign in to your Google Admin console.
Sign in using your administrator account (does not end in @gmail.com).
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In the Admin console, go to Menu AppsGoogle WorkspaceCalendar.
- Go to Sharing SettingsExternal invitations.
- Check or uncheck the box.