It's more of an issue that people have to interact with vendors outside their direct ecosystem, who maintain different email systems. I can have all the PKI inf

It's more of an issue that people have to interact with vendors outside their direct ecosystem, who maintain different email systems. I can have all the PKI infrastructure I want, if my contracting officer has to coordinate payment of a $10M or $100M deliverable with a foreign company with different laws around encryption, I may have no choice but to send some things unencrypted until we can mutually agree on certain processes.