This message is sent when an event is approved. You will receive this message if:
You are an approver for the calendar, OR you created the event.
You can edit your Email preferences so that you only receive these messages when a specific instruction or comment is made. To do this, login to the calendar system and select the Toolbox Icon | Preferences and check the option: "Disable Empty Approval Messages".
Note that if the approver puts in some comments as part of the approval process, you will ALWAYS receive this message.
Your Email address is used as the contact information for the event.
If you have a calendar login, you can disable these messages using the instructions above. If you don't have a calendar login, and your Email address is used as the contact information, you will always receive a message notifying you the event has been approved and posted to the calendar.