I have a Server 2008 R2 box running Exchange 2010 and Forefront Protection 2010. I have content filtering enabled and my SCL levels set to where I want them in Forefront. I'm filtering by keyword and file extension. In testing, I sent myself purposeful spam emails from a personal gmail account containing the keywords that I am filtering for and they get through unabated.
I checked the headers on the messages and it looks like the mails are being assigned an SCL of -1? Can anyone tell me what is going on? I know -1 means it's from a trusted sender but i'm not sure how gmail's servers got to be trusted senders in the first place!