Hi All, I have a exch 2k server on a win2k server in a win 2k AD enviroment. when I send e-mail to external services it works fine, but one domain, they do not get the message. The client gets a delay delivery or a NDR. I check the queue and there is messages waiting there for that doamin. I have sent messages to this domain many times before do not know why it is not reciving??? Any ideas Thanx