Just heard a notification from my iPhone. When I checked, there is an advert for RayBans from some Chinese website. Looks like it's some sort of mass mail out, but what I can't understand is how it has been added to my Calendar. Can someone please explain? Is there a setting I can switch off to stop this? Last thing I want is to start getting spam in my Calendar. It's bad enough in mail. Thanks EDIT. Also in Calendar on my Macbook. when I try to delete it, I get a message that if I decline invitation, the sender will be notified. what to do?