Spam notifications
Starting yesterday I've being sent large numbers of notifications on my iMac [Monterey 12.2.1] & Obviously I've checked my apple notifications and there's nothing there. They're not appearing on my MacBook or my iPhone. They are clearly spam. They come in every 5 mins or so telling me the usual rubbish about virus's , expired mcAfee subs, missed messages etc . They disappear quickly and don't seem to be stored on any of my systems but how do they get in? and how can I stop them?
iMac 21.5″, macOS 12.2