Re:IRS claims it can read your e-mail without a warrant
by Domenic_S on Wednesday April 10, 2013 @05:09PM
(#5528196)
They expect their (physical) mail to remain private because there's a massive legal framework that protects it. There's an entire section of US code regarding the operation and authority of the post office (title 39) and a whole mess of criminal code about protecting the mail (in title 18).
http://about.usps.com/who-we-are/privacy-policy/intelligent-...
That's beside the point though. People in general expect their mail correspondence to remain private, although a motivated third party might be able to defeat security.