Every day I am receiving e mail that is sending me invoices from a Periodontist that I went to last year. I can't block it because they change the e mail address every e mail that they send. I sent an e mail to the Periodontist office about this but they never replied to me. How did these scam artists get a hold of my e mail through the Periodontist ? Can I do anything other than ignore and delete these e mails ? I hope that along with these e mails they didn't plant a virus in my computer because out of curiosity I did try to look at the attachment but was never able to open it.