Doesn't block any emails at all. Just blocks any texts that are not from someone in your contacts list. This is no big deal to me as I don't need to receive a text msg from someone who isn't in my address book. Going on 24 hours now and still no BREW msgs. I literally tried all other solutions from changing email password to a hundred other things and this is the only thing that worked, unless I wanted to change my number. As for the other reply, I'm not sure what this has to do with backup assistant at all.