i need to setup smtp gateway/smarthost... basically we have three exchnage servers, eu.domain.com, na.domain.com, ap.domain.com, but all of those exchanges server send out email with @domain.com, so currently we are using a mandrake box ?? (dont ask me, why or who set it up), and it basically recieves email coming in for @domain.com and then does a lookup in local db (i believe we keep a user list on this machine) to see if user is
in , eu, na or ap , sub domain and forward mail to exchaneg server. The exchange servers send out email directly from my understanding, as anyone setup something like this ?