I haven't problems. Try from a different account (if your writing from hotmail, try from yahoo or something like that), it's possible that your server is in a spam black list (not for you, but other member) and wnaudio mail server is blocking your emails (nothing can be done as it's a problem with servers, not with Dr. White configuration). I suffered this kind of problems some time ago and the simptons were exactly what you mention.
Good luck.