only as private as you make it. they are required by law when mandated by a warrant to release IP & other (unencrypted) data they have on you. use a proxy to connect & take other opsec measures to conceal your online identity just like other sensitive web browsing activities if you want to use email "privately".
this is really only helping anonymity though, as the email protocol has no built in encryption. unless you are using PGP it really isn't apt for secure communication at all.