Why don't you want to download Mailwasher? I use the program to alert me of the content of any emails without having to download them. It has also warned me on two occasions about a virus in an attachment so I was able to delete them immediately at the server end. You can also set Mailwasher to automatically delete/bounce emails on a blacklist. Mailwasher may not stop all spam but it certainly does make dealing with the problem easier.