By the way, Spamguard works very well. I download my email using Outlook (NOT Outlook Express), and redirect the mail in the Yahoo Bulk Folder to a local folder called (imaginatively) Yahoo Bulk Folder.
Then only bona fide email reaches my main inbox. I can quickly scan through the local Yahoo Bulk Folder to look for non-spam before deleting all the junk. Saves lots of time compared to individually deleting each spam mail. So far pretty accurate, and the spam outnumbers the bona fide email about 10-to-1.