I'm still very surprised that the court ruled in this way, precisely for the reasons that you state: the right to freedom of speech does not create in anyone else the obligation to listen to you -- particularly when the medium is email. As has been pointed out many times before, email is basically a letter that's sent postage due and for which you cannot refuse delivery. That being the case, no one else has a First Amendment right to send mail to it. (In part, that's the same reasoning behind the anti-junk fax law and the "Do Not Call" registry. Other people's right to freedom of speech doesn't apply to your phone or fax machine.)