One such end-to-end email encryption solution can be found at www.jumble.io
The "better" answer of not putting sensitive information into email is true for all industries, however, more companies are installing end-to-end email encryption solutions to comply with SOX and mitigate risk in the event of a breach.
Email is trivial to secure. Just need to be able to exchange OOB one RSA key.
But being able to securely communicate with "[email protected]" don't give you much when LEO knows that you are communicating with each other.
Nowadays you need security, anonymity and usability - which are often with contradicting requirements.
[1] https://www.nicta.com.au/pub-download/full/8943/
[2] https://www.google.com/transparencyreport/userdatarequests/?...
Email is hard to secure and identified personal accounts are difficult to keep private.
The "better" answer is to do what those on Wall St figured out after various scandals and Sarbanes-Oxley - if you want something to remain private keep it off email.
[1] Sorry.