>If you have the ability to manage the server, Exchange 2003 and greater has a way to specify ip addresses that are allowed to relay. I have also setup the IIS smpt server to send email using wwipstuff. I set the smpt server to allow sending email only from the computer's ip address.
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>>I'm getting error messages when trying to emails to recipients who are not on our network. Exchange is saying unable to relay for x, So, am I going to have to setup Blat or some SMTP server to do this?

There are others who contol the exchange fiefdom. I may wind up using mercury mail so I can send my own smtp. I've already tested it here at home and it works. Oh well, I'll have to check on the policies to see if that is permissible. I'm going to need to be able to send a couple of thousand emails each day/night for this project