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receiving spam emails from our own email addresses

Moonatwork asked
Last Modified: 2013-12-09
i am using OS Win 2003 Server sp2
MS Exchange server 2003 Sp2

Since 4 days some of our staff receiving spam emails using our their own email addresses,
when i see from email address, its their own email address

and some receving from different email address but same domain name, that user doen't exist in our domain...
i contacted our email filter provider websense, they said it looks like spoofing your domain,

how to prevent this, how to to find out who is spoofing our domain. what are the best ways to protect our domain and email system by thsese kind of problems..
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