These spam emails are designed to get around your spam filter by changing sender addys with each sending. Have you gotten one from yourself yet. I have. Any email address can be add as sender to any email. Thus, there is really nothing you can do about it. No it's probably not spyware, just the way spammers operate. Don't know what email client you are using, but most have some way of making rules to send things to junk folder. Maybe something like 'any email containing casino in the subject'. Still a good idea to look through that folder for anything you need.