Can someone tell me where to check to see if I have an open relay server? I cant find the setting in Exchange 2007.Tommy

Exchange 07 isn't an open relay by default, so you are safe out of the box, but an easy way to test is to telnet to it on port 25, and try to email from hotmail to yahoo using your exchange server. If it comes back and says 'relay denied', its not open. for instructions on talking to exchange via ehlo: http://exchangedeepthoughts.blogspot.com/2007/12/testing-mail-server-via-telnet.html