What should you do?
Your organization has one Exchange Server 2003 server named Server1.
You deploy a custom application on Server1. The application is configured to send e-mail messages to a mailbox named App1.
The return address on messages sent by the application is Server1@contoso.com.
You need to ensure that the App1 mailbox only receives messages sent from Server1@contoso.com.
What should you do?