Delete all e-mails from sender not in specific domain

Hey guys,

I have a mailbox that works as our helpdesk tunnel. So if an employee sends an e-mail to that mailbox, the helpdesk pulls in the messages in the inbox and then deletes them. The only problem is that I want to only allow e-mail addresses from our domain name. Is there a rule that I can put in that will allow me to automatically delete all e-mail not from a specific domain?
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In Exchange 2007 you can create a transport rule under org config, hub transport, transport rules, new rule, the criteria would be from user outside the org, to the email in question, silently drop the message.

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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
You can setup a transport rule....
Exchange Management Console:
Expand Org Config -->  Hub Transport -->  Select the Transport Rules -->  Create a new rule
Name it... Conditions, check sent to people [add the account you dont want outside email to] also check from users inside or outside the org [choose outside]
Actions:   silently drop the message
Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
Looks like dmwynne beat me to it...which he is correct.
I have attached a screen shot, replace email adress with address from which you need to receive mails and it should work.
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