I reversed what I dod and the emails started to flow again.
Here is what I did:
I went to the properties of the Default Virtual SMTP server.
Went to the Access Tab
Clicked on authentication
and unchecked Anonymous Access. <--------This is the only change I Did
Basic Autentication is checked
Integrated Window Authentication is checked
The Relay button setting:
Only the list below (there is nothing in the list)
Allow computers that successfully authenticate is checked.
So the only change I did is the Anonymous thing.
How can I stop the spammers while allowing us to recieve email?