troubleshooting Question

Moved from Exchange 2003 to 2010, now getting SPAM through Postini

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PunkGeek asked on
ExchangeAntiSpam
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This weekend I moved our organizations mailboxes from our old 2003 Exchange over to a 2010 Exchange server and now we are receiving a large amount of SPAM even though mail is being processed by Postini.  I have our firewall and the receive connector only accepting connections from the Postini address range.  I can't think of how SPAM would be making it in.

What else should I look into?  Is there something obvious that I missed?
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