I'm having the same issue. An employee has his gmail account setup in Outlook, and I am getting flooded with alerts. 83 Hits so far today. An example is below. We use Office 365 for our company email. I guess I'm not sure what to do here.
Is this something I need to take action on and is serious? Or do I need to go the route of blocking the notifications.
Mrs.Cheryl%20Mc%20Daniel%3Cichimori%40charity.org%3E&subject=The%20Will%20Of%20God&attachment=part000.txt