That's a FAKE yahoo address. It didn't come from the real Yahoo!
No. Your wrong. Anyone can report abuse on any of the message boards for whatever reason. I received the exact same letter from Yahoo because I left a negative review. You can report abuse, too! Go to the Yahoo message area, open a message from someone, and if it offends you, click "Report Abuse". The person who wrote the original message will receive the exact same letter.