Filter incoming emails MS Exchange 2007

I'm running Exchange 2007 on Windows 2008, I have configured ticketing system for our organization, users send their requests to and a ticket gets generated. But lately this account started to get alot of spam and generate tickets. My question is there a way to restrict to allow only emails from our domain to get through to or other effective way to prevent the spam emails?

Thank you,

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GovvyConnect With a Mentor Commented:
Go to properties of the Group>Mail Flow Settings>Message Delivery Restrictions>Properties>Accept Messages from>Only Senders in the following list...
Sergey_NesterenkoAuthor Commented:
Is there a way to accept entire domain and not add email address individulally?
Sergey_NesterenkoAuthor Commented:
Thank you very much for the help!
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