We have just purchased a Barracuda Spam Firewall 300, we have set it up but are having problems authenticating with our Exchange server (2007). I spoke to Barracuda about it and they said I need to exclude the Barracuda box from authentication from within Exchange, how do I do that?
I believe this is what you are looking for:
http://technet.microsoft.com/en-us/library/bb232021.aspx