Email Fowarding not working

I have performed the steps in the related question and email forwarding still isn't working.  

I get a Delivery Status Notification (Failure)

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.


There must be something else that is blocking the server from forwarding the email to an external address, anyone any ideas?
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bootuppcAsked:
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bootuppcConnect With a Mentor Author Commented:
The server doesn't forward to any address.  However the server is maintained by another IT company and they have agreed to look into what is happening so I should probably close this thread.

Thanks to all for your help.
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sweetfa2Commented:
Can you telnet on port 25 to the destination mail server?

Are you sending via an ISP or directly - do you have a reverse DNS entry that matches the domain you are sending from?

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bootuppcAuthor Commented:
I doubt it the destination mail server is a Microsoft server as it's using their online exchange environment.

Emails are being sent directly from the server as far as I know.
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sweetfa2Commented:
All external mail servers communicate via port 25 (smtp).  As far as I am aware if you are talking to an external mail server then that is the port it will be receiving on regardless of whether it is exchange.

If you can telnet to port 25 on the destination server you eliminate network restrictions, etc, to isolate where you should look for the problem.

Does your server work to other external accounts?
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bootuppcAuthor Commented:
Good Idea I can try that and let you know.
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bootuppcAuthor Commented:
Not a proper solution, just went down a different route to fix the problem
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