I recently deployed Exchange 2007 in a test environment with some DNS domains I use for a lab. Almost immediately after I opened port 25 for mail, the network started performing very badly. I took a look at the Queue Viewer and there were about 6000 messages in the queue going outbound, indicating I had obviously created an open relay. I quickly stopped the Exchange Transport service and normal operation resumed.
I will gladly provide 2000 points to anyone who can provide ALL of the following:
-An easy to follow procedure to eliminate Open Relay on Exchange 2007
-A recommendation for a decent software based SPAM filtering solution
-A way to test for open relay / SMTP best practic config
-The best website for finding out if my IP addresses are black listed for open relay.
Thanks in advance.