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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dmwynneConnect With a Mentor Commented:
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.
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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