I have a list of 3000 email addresses, some of them are not valid, but most of them are. I need help deleting the invalid email addresses so that my mail server will let me send a group email to the valid email addresses. This is obviously an easy job for someone who knows anything about computers and this sort of thing. I can send an xls. file of all the 3000+ email addresses, and ideally you would send me a list of only the working email addresses in xls format within 2 or 3 days.