It’s been a long time since I’ve read Dale Carnegie’s “How to Win Friends and Influence People” but I’m pretty sure there isn’t a chapter on holding people hostage. That’s generally a bad idea, and so is Yahoo’s decision to disable the forwarding feature for its email service, which effectively prevents Yahoo Mail users from hightailing it

Source: Hot Hardware – Yahoo Tries To Hold Users Hostage By Disabling Automatic Email Forwarding Feature