I have found vineeth's post here, in regards to turning off email scanning, but it mentions Version 3.5 ( and being different from Verion 2.0.
I have received a question on emaIl scanning on the Comcast forums where the OP wants to turn it off as they feel it is slowing down the their email download. I'm sure they'll get an error when they do turn it off, but since I am still using NIS 2010, I can't see the exact procedure for turning it off and preventing the error as vineeth posted above. I know the somethings changed between Version 3 and V 4 so any help would be appreciated.