If you create a notification request or Email reminder request, the calendar system will periodically send you a message to make sure that the Email address is still active.
Disabling This Message
The calendar system administrator can disable these messages by going to System | Configuration | Email Configuration and setting the value for "Reconfirm Address Period (Days)" to zero (0).
If you no longer wish to receive notifications or reminders, do nothing. After a few days, the system will cease sending the notifications or reminders.