The Fourth Amendment is not outdated, but it is grossly misinterpreted.
"The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures . . ." clearly protects our email, the modern equivalent of being secure in our papers. The interpretation that scanning our email is okay because it is Yahoo's property or Google's property is a clear violation of the intent of that amendment within the Bill of Rights (privacy - the central tenet of the all-powerful "Penumbra" of the Constitution).
I would like to see President Trump make a stand for civil rights, including privacy. It's not my top priority for him, but it would be the right thing to do.