We are having trouble receiving any emails from 1 particular client. We are using exchange 2007, and forefront. The client consistently sends emails to a specific user and it never makes it there. He sends it to the users personal account and it gets there with no issues. I checked my exchange server and searched on the clients email and get nothing back with the address going through our excahnge server. It does not appear to make it to us. I didnt see anything in the forefront quarentine either, and also added this client to the "allowed senders" list. Still we get no email from them. They do not receive a bounceback indicated we are not letting it through, and they insist ithe email is leaving their building. THe address they are sending to (ours) is correct as I was able to see the email address on our users personal email account. Are there any other ways i can troubleshoot this situation, as this is a client and I am not able to go onto their server and exactly verify their settings.