Why YAHOO IS ALLOWING the false emails?

It's not a matter of actively allowing it as it is a matter of scammers in other countries using a name people will recognize as a hook to scam them out of money. I've lately received a few scam emails from a scammer claiming to be an army officer in Iraq witha stash of cash that he needs to get out of the country. There are no end to the scam stories, so if it sounds the least bit suspicious it most probably is a scam.