I have to admit, for most other spam, SpamGuard works. Except for this particular (and dangerous) spam my inbox is usually free of spam.
I'm just saying there is a chink in the armor of SpamGuard. An evil hacker has found SpamGuard's Achilles heel.
After my first painful lesson, I now know enough not to click the URLs.
I just pity the fools (other Yahoo users) who have to go through what I did.