SPAM from inside

I am going through the archive for the IMF and I am noticing that some of the SPAM seems to be coming from in internal users.  The display name in something wierd at ourdomain.com.  If I open the mail using outlook epress the email address is a vaid user.  
pearlvisionAsked:
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bikvi_sibroCommented:
It is just a spoofed e-mail, nothing to be scared about.  Here is some more information on it: http://www.cert.org/tech_tips/email_spoofing.html

As for how to prevent it, Exchange has the ability to suscribe to an external spam filtering source.
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pearlvisionAuthor Commented:
What are some good external spam filtering sources?
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poweruser32Commented:
postini or message labs
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pearlvisionAuthor Commented:
What abouta good RBL?
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