E-mail stays on the queue.

hello everybody,
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?  

Thanks
ggmisadminAsked:
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SembeeCommented:
If you have been blocked, then you would need to ask them.
You could use one of the internet services such as dnsstuff.com to see if those can connect to the server.

The workaround is to use an SMTP Connector to route email via your ISPs SMTP server.
http://www.amset.info/exchange/smtp-connector.asp

Simon.
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