I am about this | | close to going to a white list. If you are not on the list you dont get through. I currently use SPAMHAUS for my block list.
Even with that I still get 10 to 15 spam messages per day. But I've had the address a long time it's a real short address and I like to use it so. I may actually have to go to a whitelist
To the original poster what version of Outlook or what email clients are you using? you need to be able to look at the headers of the message. I can tell you how to do it if you can tell me what email client you're using.