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VoodooFrogFlag for United States of America

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Exchange 2010: Spoofing issue

Today, a couple users received a spam email from another user within the company.  The email originated from an IP address in latin america, not from within our network.  To me this means that someone through data mining etc, got a few user email addresses and sent an email to multiple people using one of the addresses as the sender.

What can I do to prevent this from happening again?
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bcrosby007
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We already have spf records set up. And Sender ID is already enabled.
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