Phishing for the lottery

It’s strange to note that in the last couple of weeks, I noticed a very interesting pattern of lottery phishing e-mails. One was that most of the e-mails talked about winning the UK lottery. Why specifically United Kingdom, I have no clue.
The other was that every email I’ve ran across has a return email of yahoo.com or yahoo.com.uk.
Just curious, but Yahoo? Could someone there do something about it and track down where these are going? It’s strange that they don’t find random emails but specifically target Yahoo as the drop zones. Not that I’m complaining since I’ve won about $48 million pounds every other day for the last three weeks, but somehow I don’t think it’s good for the British treasury to pay me that much in such a short time, ya know?