How do I block random people adding meetings to my calendar?

1. In Outlook, go to File and then “Options.”
2. Then, select “Mail” from the Options menu.
3. In the Mail menu, choose “Tracking.”
4. Under “Tracking,” deselect the option that says, “Automatically process meeting requests and responses to meeting requests and polls.”

You're welcome.

To the Microsoft techs responding to these questions; you should find another job because you absolutely fail at this one. Setting up rules to block emails will NOT keep meeting invites from being added to your calendar if the option above is still checked.

If this works......a HUGE thank you!! This started up yesterday and every time I delete an event, another one pops up. Ridiculous!

My phone won’t allow me to just delete the message and the invite isn’t in my email. I have to cut (as if I’m going to paste it somewhere else) each one twice to get rid of it but the first one sent a response. Now my calendar is flooded with spam.

I sooooo agree with CH .,.. i am getting VERY angry that this issue is still happening!!!
Open my agenda... i use it for my 3 businesses.... and spending so much time every time to just delete SPAM appointments that have bene set in my agenda.... WTH Microsoft !!!
As a business we are "this close" to cancel all Office 365 etc etc etc ...

I want to try this! I don't see the "not in contacts" option in any of the rule options and only emails with "attachments" as how I could block a calendar invite - ?

According ot my agenda the last few weeks..
I had to visit at least 20 sex hotels... visit a lot of sexual websites.... started with a diet a 1000 times etc etc etc.
FIX this ****...
I DO (!!) use the auto add to agenda for work when people send me mail to set dates etc.
Using rules is a No go as next day all comes from a new domain ....