convertasam

It’s the virtual SMTP server that comes with IIS 6.0.

Hi there, I'm new to the forum and am seeking help with an on going issue that has plagued my company's e-mail server for way too long. We're currently victim of a Taiwanese hacker group that is using our server to relay spam e-mail. Up until a few weeks ago I had no idea how to prevent them from using our server for relay and still keep my users able to e-mail from their company e-mail addresses. The day before last I started changing the configuration on the server to require a username and password for outbound messages using basic authentication. I created a user, applied the password, and configured outlook correctly. When I tried to e-mail a message using outlook I received a 550 cannot relay for such and so. Worse yet is all my users are getting a 550 cannot relay. What can I do to let all my users e-mail from home and not have the spammers muck up my server?