Thank you for the reply. I do know how to unsubscribe when I have previously elected to receive emails from somewhere; however, in this case, I have never done business with Wish, have no account(s) with them, and did not subscribe to any emails.
Over the last few days, there was a sudden and persistent deluge of emails to (now) three of my Apple email addresses. All spam. All unsolicited. Having to block and report every message at multiple addresses is tedious and time consuming and there should be a better option at the server level to block a domain.
I will say that the spam has now decreased, so I may have been able to stop the issue by notifying Wish support directly. Their responses were confusing, but the spam emails seem to have stopped for now.