Hi Sendmail on my linux (FC3) box does not do a great deal but I've tested it and it sends mail out - eg. [email protected] - on to an exchange server on the domain happily enough. What I want to do is set up some sort of forwarding so that mail from say [email protected] in Exchange is passed on to sendmail on the linux server. I think I can setup the Exchange side OK. What I'm not sure about is what I have to setup in the sendmail conf file to stop mail simply being sent straight back to the exchange server - and then bouncing back and forward (forever?). Any help gratefully received. Ewan