junk emails which come only to my iphone
I receive a large number of similar looking junk emails to my apple mail app only on my iPhone. They do not come to my email accounts (yahoo and gmail). They also do not come to my iPad or Mac Mini. I tried designating some of them as junk, to no effect. I suspect it might be some kind of malware. The emails are mostly random ads.
iPhone 5s, iOS 12