1. Open Outlook 2003 or 2007
2. Click Actions --> Junk Mail Options
3. In the Junk Mail Options window, click on Blocked Top Level Domain List
4. In the Blocked Top Level Domain List window, scroll and select any country you wish to block, based upon the top level domain name assigned to that country. For example, if you wish to block Nigeria, click and select NG (Nigeria).
5. Click Ok.
6. Back in the Junk Mail Options window, click on Blocked Encoding List.
7. In the Blocked Encoding List window, scroll and select any encoding type you wish to block. Make sure you only block encodings for countries or regions you do not do business with. In English speaking countries, much of the legitimate email will use US-ACSII or Western European. I also add Hebrew to the list of NON blocked encodings.
8. Click Ok all the way out.
