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ICloud - block calendar $19.99 Ray Ban sunglasses spam?


I keep receiving invites on my iCloud calendar to some sort of online Rayban and Oakley sale for $19.99. It's obviously spam. It looks like they've invited people en masse as there are several other email addresses similar to mine on the invite. How do I block this invite from popping up? How do I prevent this from happening again in the future. I don't want random people (or anyone) adding events to my calendar.

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