I don't know if it works on all email addresses, but on mine I can hover my cursor over the senders address and will often find that it is NOT the name of the company that the subject line says it is. It will have an address that really tells what kind of person it is from. Instance, I got an email stating that my Bank of America account had been closed. That was the subject line. I hovered and saw that it was from AbcUguessedIt.com. No doubt that it was a scam from that but I DON'T have a BofA account anyway so if they closed it, that wouldn't bother me! These places buy email addressed and send hoping that they can get someone to respond. Sometimes they contain links to porn or "MALE enhancements" or buying drugs online.
Try hovering your cursor.