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

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?
PunkGeekAsked:
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AlspaCommented:
do you have non-account blocking ON on postini?  BCC'd spam will get thru postini if non-accounting blocking is not enabled.  (this means all accounts need to exists in postini)

also are you sure the receive connector is properly configured?
there are 3 ways to enter ip's when you create a receive connector using the gui. (there is a little down arrow next to the plus/add sign when entering an IP)
Once i thought i was entering ip network 64.18.0.0 , subnet mask 255.255.240.0
and instead i had entered a range from 64.18.0.0 to 255.255.240.0, postini was working, but half the internet was able to send to me as well directly.  needless to say i was blaming postini, but in the mean time it was my connector.
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PunkGeekAuthor Commented:
Non-account blocking was not on.  This has always been set on our account and we never had issues with spam with our 2003 server.  When I turned it on we stopped receiving spam.
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