Hi. I'm Aliza, a BC patient and the site's unofficial resident Medical Librarian. You ask a kind of IT question, but I think I might be able to answer you. You must check your spam folder and see if the emails from this site are going there. Then you must mark emails from this site as safe so that they can go to your inbox. I suspect strongly that that's what's happening unless there's something more mysterious beyond my powers of computer expertise...;)
Hope that helps.