I get plenty of scam mail, but the scam mail from predatory journals has a unique habit of using odd substitutes for normal roman letters. For example;
You Are Inᴠіtҽd to Pυbliѕհ Your Original Ɍҽsҽαrch with Us
Other scams don't do this. They just make their appeal in normal characters. For example;
Bad grammar, but no funky letter substitutes. So what are the funky letter substitutes meant to achieve? Is it supposed to evade a spam filter? It seems like it would be really easy to filter for, because no normal person does that. Is it supposed to look more credible? How could that look more credible?
I am fascinated and mystified.