New installation of 2003 server all relevant updates carried out. Exchange configured to download mail from mail server using pop connector. Sometimes (and this happens randomly) a users email (usually only 1 email) will get redirected to the administrator which is set as the account for non existant email addresses. Therefore this is what you would expect if the email address is incorrect, however, there is nothing wrong with the email address details. This is happening randomly for various users. Any help would be appreciated.