4000 Emails per hour on iCloud account. How do I stop it?

I’m getting 4000 +/- emails per hour. Most but not all go to junk. How do I stop it?

SpamSieve can’t prevent people from sending you spam. If most of it is being automatically caught, that is good. Training the ones that get through to your inbox should help.

But that is an abnormally large number of messages, so you may want to try to figure out whether they are coming from a common source, if they’re being forwarded from one of your other accounts, etc.

Most are in the Apple iCloud account. Some in another but not anywhere near that many. Apple is no help.