Okay, confusing situation here with a possible open-relay. Here's the situation:
I have a SBS 2003 server running Exchange 2003. All of our outgoing mail is sent through a smarthost (smtp connector is configured to send through our isp's mail server).
All of a sudden today our emails are getting bounced back and I called our ISP to figure out if we were blocked for some reason. They say that they think we're blocked due to sending out more than 1000 emails in a day or hour, whichever comes first. I say that's probably not possible, so I take a look at the usage logs on our SBS 2003 server. Administrator has sent over 7000 emails to external addresses in the past day.
So, I run the connect to the internet wizard to see if that fixes any possible open-relay issue. It completes successfully.
I check the following sites with the following results:
mxtoolbox.com: NOT an open relay
dnsgoodies.com: YES I am an open relay
: First 7 tests say NO, but the last test says YES I am an open-relay.
dnsstuff.com: NOT an open-relay
So what's going on. I need to get this resolved ASAP and I'm confused as to what's even going on.