Why aren't my support emails arriving to every one?

Hi guys,
           I am having an email issue in the office and am looking for some advice.
 We have a support@...  email address that goes to a few different people some using outlook and some using Gmail. Most of these are able to send as support@...  as well. This worked fine until a week ago. As far as I know nobody has changed any settings on the server. There was one day that the server wouldn’t boot up properly and had to be forced shutdown and rebooted. All our internal mail from support@...  is working fine but if someone outside sends an email to support@... then only one person gets it.

The server we have is a Microsoft windows server 2003 for small business (service pack 2)
I have shut down and rebooted the server properly again but this hasn’t changed anything.

I am not too familiar with this server and am nervous of changing any settings in case of messing up the office network. If anyone who knows this system could advise it would be great.
Kind regards,
IP4IT StaffAsked:
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Andrew DavisManagerCommented:
You need to start at the logs.
See http://www.msexchange.org/articles-tutorials/exchange-server-2003/monitoring-operations/Exchange-2003-Message-Tracking-Logging.html

also as you included SBS2003 in the groups i will assume this is SBS. in which case it is a good practice to re-run the connect to internet wizard.

Let me know how you go.

Have you looked at the queues?
Try looking at the NIC settings I have seen some settings accidentally changed, for me was some one was looking at settings and deleted the Gateway, and clicked ok, everything was good till a re-boot was done and same symptoms as you had above.

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