I have made a site which requires membership but for some reason the validation email is not going through to yahoo. I have tested if the mail function is working by sending to other emails and it is working fine. I have come to the conclusion that it is yahoo that is blocking it. I have emailed yahoo to resolve this issue but in the mean time I would like to ask the community if you know a workaround. I have searched the forums but have no idea how other people have resolved this issue :/