Its actually fairly easy to setup a decent mailing list without having to have approved senders, but Exchange and its built in functionality is probably the roo

Its actually fairly easy to setup a decent mailing list without having to have approved senders, but Exchange and its built in functionality is probably the root cause of a lot of these. The ones I have setup are pretty easy to stop since we do some basic checking of the e-mails sent anyway (e.g. attachment too large).