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Thanks to all for the great information.
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I am setting up a &quot;test&quot; network/domain, to mirror our &quot;live&quot; servers. &nbsp;The test Exchange 2003 server I have setup won't send an email to my yahoo account, but it does send email to our &quot;live&quot; exchange server. &nbsp;Now, the &quot;dummy&quot; domain and email addresses I have setup on my test domain are not real addresses, so I am guessing that is the problem. &nbsp;Does Yahoo do some sort of dns lookup to see whether or not the sender domain is valid? &nbsp;If so, why doesn't my real, or &quot;live&quot; exchange server do the same thing? &nbsp;Basically, I am just trying to make sure my test server can send email properly, but obviously I am missing something.<br />
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Thanks
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I am setting up a "test" network/domain, to mirror our "live" servers.  The test Exchange 2003 server I have setup won't send an email to my yahoo account, but it does send email to our "live" exchange server.  Now, the "dummy" domain and email addresses I have setup on my test domain are not real addresses, so I am guessing that is the problem.  Does Yahoo do some sort of dns lookup to see whether or not the sender domain is valid?  If so, why doesn't my real, or "live" exchange server do the same thing?  Basically, I am just trying to make sure my test server can send email properly, but obviously I am missing something.

Thanks

Sending mail in Exchange Server 2003

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.