Also, email is fundamentally insecure. The to/from fields leak who's interacting with whom. On top of this, email uses DNS which has its own problems. OP, read

Also, email is fundamentally insecure. The to/from fields leak who's interacting with whom. On top of this, email uses DNS which has its own problems. OP, read up on http://www.darkmail.info/ http://www.darkmail.info/ but I don't event know if DarkMail is the answer. Maybe something more drastically different like https://gnunet.org/ https://gnunet.org/ is better which is strictly P2P and replaces DNS too.