How to make sure that relaying mail through my Exchange server can *only* be done via password-authenticated accounts?

Hello,

Can anyone tell me how to make sure that relaying mail through my Exchange server can *only* be done via password-authenticated accounts... NOT just trusting the accounts because the SMTP session originated on my network?

Thank you.
Duncan007Asked:
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NutrientMSConnect With a Mentor Commented:
Hi,
Here is an clip from Microsoft on Testing SMTP using Telnet commands. This way you can test using a legitimate address on your domain from inside your network and it should not go through.
http://technet.microsoft.com/en-us/library/bb123686(EXCHG.80).aspx
 
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Duncan007Author Commented:
Thank you.
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