Steve Jobs may like interacting with his public via email, but the same can not be said for AT&T CEO Randall Stephenson. One guy emailed him twice in two weeks and was threatened with a C&D. Yikes.
The emails seemed relatively reasonable, too. The first was "a request to bump up his iPhone eligibility date and a request for a tethering option", with the second being a complaint about AT&T's new data rates. Nothing crazy about either of those.
But after he sent his second email, a fellow by the name of Brent called him, thanked him for the feedback and advised him that further emails would result in legal action.