I have an exch 2k3 box on a w2k3 domain and since last week e-mails sent to a specific domain stay on the queue and don`t leave. I tried to telnet to port 25 the MX record of that domain and I cannot get connection. Nothing is changed on my firewall. Could it be possible that my e-mail server has been blocked to send e-mail to that particular domain? In that case how can I check that?