I recently moved my Exchange 2003 setup from one office to another and at the same time went to a frontend / backend setup with servers in two locations. I have done this before and didn't have any problems getting it setup.
Now my problem is that the new frontend server is getting hammered with spam and I can't stop it. I have blocked ip's and subnets and done everything I can think of and it just keeps coming. At one point there were over 1000 email queues open on the server and all I can do is freeze them and delete the queued email.
Can someone please help me block the relaying and still allow external mail in? I have done this in the past but can't seem to get the settings right this time.