If all one wants to do is communicate securely with another person and what your typing is private but not "illegal", then why even send email. Simply use the D

If all one wants to do is communicate securely with another person and what your typing is private but not "illegal", then why even send email. Simply use the Drafts in GMail. Compose an email and leave it in Drafts. Each person amends the draft and they can agree on times to check and update. This has been done with great success before if you want nothing "going across the wire" so to speak.