Last month a rash of spam calendar invitations began showing up in iCloud users’ calendars from unknown senders. Benjamin Mayo at 9to5Mac reports that Apple has begun rolling out a ‘Report Junk’ link on iCloud.com to address the situation:
This lets users remove spammy invites from their calendar and reports the sender to Apple for further investigation.
At the moment the fix is available through iCloud.com only. Presumably the feature will be added to a future update to iOS, though it has not made an appearance in the iOS 10.2 betas to date.
If you receive a spam calendar invitation, log into iCloud.com, navigate to the spam invitation, open it, and look for the ‘Report Junk’ link. Clicking that link and confirming that the invitation is junk will remove the event from your calendar and report the sender to Apple. Calendar spam can be reported as junk whether or not you have accepted the invitation first, although it is best to avoid accepting spam invitations because it alerts the senders that the invitation was sent to an active iCloud account.