Mildly annoying, but “No problem,” I thought, “I’ll just unsubscribe from it”. So I clicked on the “配信先の変更・停止はこちら” link, entered my email address, hit the confirmation button, and thought that would be the end of it.
But no, then I got another one. And another one. And another one.
It turns out they have literally dozens of different
spamshots newsletters, and the “unsubscribe” link only works for that particular one, not all of them. It took almost a week before I found the link to the page where you can switch all of them off.