Stop Calendar from Making "Natural Language" Events

So, I noticed an event in Fantastical 2 that I had no idea where it came from – it was on a calendar named “Found in Natural Language”.

The “Show in Mail…” link opens the following message, that was in Spam, caught by SpamSieve.

Quite an annoyance to see that something in macOS aids and abets spam messages creating events in my calendar.

How to prevent?


I found this online. Hope it helps.