Small Business Server 2008 Flooding the network

Hi All
I'm having an issue with my new SBS 2008 system, at the moment it is the only server on my very small network of only 5 PC's all sitting behind a CheckPoint Safe@Office
The problem I am having is when I enable Exchange 2007 and particuarly the Transport server, my network effectively stops due to congestion. it would seem that once this service is enabled the server starts forcing loads and loads of DNS queries out to the internet, which my firewall picks up as UDP Port 53. Which itself actually gets hot enough to cook an egg from the work load that SBS is trying to force through it.
Would anyone know whats causing this and how to stop it? the only difference I can find that this set up has to another client of mine is that the working site has a Smart Host that all there mail is relayed to where as this one does not. but surely that can't be it otherwise how are you supposed to operate with paying for a smart host too.
Thanks in advanced!!!
Steve
yellowteamAsked:
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Can you verify the Queue and see there is no spamming or relay from your server going on, as this would mean a lot of emails and a load on the network.
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yellowteamAuthor Commented:
Hi Rancy
Unfortunately I can't open the Queue at the moment because I work remotely I've had to stop the Transport Service so that I can even get into the environment.

I dont believe to be Spam or relaying as it happens the moment the service starts not after a short amount of time,  and when it does there are no incoming connections to the mailserver
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
If you keep the stores as dismounted and start the transport service what is the observation.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
The reason is asked was that even if there are some mails stuck to go out or come in, the moment we start the service the flow would start and not after some time. Also there could be some chance of database corruption.
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yellowteamAuthor Commented:
I've just tried for you and if I make sure that every single exchange service is stopped and then start just the Transport service, it does excatly the same thing, the network goes nuts and floods
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Do you get any errors in the App or Sys logs in regards to anything ?
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yellowteamAuthor Commented:
It looks like you may have been right that we were being used as a relay

Found these in the App log when I started the Transport Service

Queuing status at shutdown - Submission queue: 0 message(s); Delivery queues: 1173 message(s); Unreachable queue: 0 message(s); Poison queue: 0 message(s).

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The background scan of the transport queue database has been stopped. 2877 message(s) found so far. There may be other messages left in the database that have not yet been loaded.
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yellowteamAuthor Commented:
I've just found that as a default Exchange has a rule under Accepted Domains there is an External Relay Entry with * as all accepted domains

Would you know which settings I need to change to prevent this? and is there a way I can purge the queue?
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yellowteamAuthor Commented:
118763 emails waiting in the queue, and climbing
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
So your server is open for relay.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
Any updates ?
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yellowteamAuthor Commented:
Hi Rancy
Yeh I killed that External Relay with a * that I mentioned and took care of the whole queue by moving the physical files to a different location. So far so good I believe, mail seems to be going in and out successfully
and my network is no longer saturated. Thanks alot for the very quick help!
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
cool .... good news and no more performance issues.
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yellowteamAuthor Commented:
None caused by anyone other than me at least :D
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