The same unwanted junk appears every day in my spam folder on my iMac. How can I permanently get rid of it? (Some looks like porn sites I sure don't want to open!)
You can't. Just be careful in the future who you give your email address to. I get those too. I ignore them for the most part. It's futile to do anything else. Just lucky it's filtered to the spam folder. That's the "Junk" folder on iPhone.