Re: Hancock's half hour
Email can be made to be secure, but not within the control of the sender, and at the cost of reliable delivery.
You can enforce transport encryption, but then what happens when none of the receiving servers for a domain support it? Don't send to that domain?
Assume they do, your email is securely transferred to the next hop. Now you have to trust that infrastructure is secure, there could be a dozen more hops, and you have no control over the security practises of any of them.
If everyone secures their email infrastructure then everything is coming up roses. But it's 2019 and my ISP doesn't even offer TLS on imap or pop3 ports for email collection. What hope do the rest of us have that the SMTP transport across the internet both supports TLS, and has it enforced?
Or do you mean end to end encryption like PGP or SMIME? because they require everyone to have keys, and know how to communicate them.