The company MK Net Work has two server-side products that does it. One is “Email Size Limiter” where you can apply such filters and the other is “ZipMail Realtime”.None of these are free, it’s not easy to find free server products for corporate solutions.
Its not quite what I need.I need a server added tool that on the server checks every e-mail going through the router. If the mail contains certain file types then move the file in some kind of quratine database and leave a note in the original mail that a file was removed.