http://www.slate.com/articles/technology/future_tense/2015/09/ecpa_reform_the_1986_email_privacy_law_might_finally_get_updated.html

A federal law protects some of your email from government snooping without a warrant. But it doesn’t protect your email if it’s been left on a server for too long, and, worse, it doesn’t protect your metadata—information that can get you arrested and prosecuted, that can reveal intimate secrets about you, and that would expose the entire network of people you talk to. On Wednesday the Senate Judiciary Committee is set to address the first problem, but reform efforts in both houses of Congress have largely passed over the second issue. In dodging the problem of metadata, legislators have missed the forest for the twigs.