Email may get more private

Despite the fact that email is actually as private as a postcard, a judge ruled recently that it's like a phone call. I think email is more like a written letter than a phone call, but I'm not a lawyer and I don't know what police search laws apply to letters.

I find it interesting that the judge thinks we should reasonably expect privacy in our email. I don't expect privacy now: I know my boss can read my email if she wants, and hackers can intercept if they care enough. But SHOULD we expect privacy in our email, in the same way we reasonably DO expect privacy in mailed letters?