Port redirection issue

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HI guys

I'm not sure if this is the right place to ask this question or not. If not, please let me know where I should ask this question.

Due to an ADSL issue I had to factory reset my ADSL MODEM (DLink 604+). This has now caused an issue with incoming mail (our Exchange mail server ) which sits behind this router on 192.168.0.200 because the port redirections we blown away by the reset.

I have set up Port Redirection to 192.168.0.200 for ports 25, 80, 110,

The mail server is sending mail out and receiving mail sent to its domain but I cannot receive any mail from the outside world. For example, I have tried to send myself mail from a Hotmail account but it gets rejected (Delivery to the folowing recipients has been delayed).

The router has a static IP - none of that has been changed so it should be just a matter of letting the traffic through ot the server.

I am a bit of a novice at this. What have I missed? What can I test?

Thanks....Andy