On Wednesday, Virgin Media advised customers not to respond to an email sent by one of the companys suppliers because they would actually be sending their replies to all others who have received the same email. Graham Cluley has the details on what happened. It turns out that Virgin Media wanted to inform customers on some changes to the way they logged in to Google service with their virgin.net email address. However, because an improperly configured mailing list was used, if users r…