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Exchange Server and Spam

Last Modified: 2014-03-10
Our Exchange server was recently updated from 2003 to 2010.  We have never had any hardware or software anti-spam solutions implemented, but after moving to Exchange 2010, we have become inundated with spam.  We have DOZENS of domains added to our whitelist that were being blocked as spam and hundreds of spam emails every day that manage to get into our inboxes.  We never had an issue with 2003.  I "heard" somewhere that 2010's spam filter was pretty poor, with the intention that it was intended to be used with another anti-spam solution.  First, is there any truth to this?  Second, is there a reason why spam became an issue after the upgrade?  The company that did the upgrade wants to "come to the rescue" with, no doubt, an expensive solution, while it seems to me that the Exchange upgrade was somewhat incomplete to begin with.  I'm not necessarily looking for add-on anti-spam solutions, but more curious why the upgrade seems to have led to this and if there is anything built into Exchange 2010 that can help.  Anyone have some insight for me?  Thanks.
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