Our domain can't receive emails from one of our client domains, i.e. all of our users can't receive from all of their users. We send and receive plenty of mail from similar companies fine. I know, your saying "it's the sender's problem". But since they do business with us it's OUR problem. They also say we are the only domain they can't send to.
We are running Exchange 2000 Server SP4 on a windows Server 2000 box with a W2003 Domain Controller.
I have searched for days for a solution. Our PIX and Exchange 2000 Server appears configured correctly. Our ISP did an MX test and says we are fine. EVERYTHING looks fine but we don't get their mail! Any ideas? Any help would be gratefully accepted.
BTW, I lost my sense of humor yesterday.