It’s Amazon’s internal network, and Amazon’s email system, so they have the full right to control what happens on their resources.
At the same time, I find that deleting the an email after it has been sent by the sender unknown to the sender to be a kind of gaslighting, and dystopian. Having a policy to not organize using work resources might be harsh, but at least it is more transparent as in the proverbial line is drawn in the proverbial sand.
Especially in the world we live in right now - email and other work-hosted communications platforms are not a resource provided by work, they are the WORKPLACE.
I think I disagree. This is exactly the role of the government to adjudicate. I would suggest a standard something like "everything is allowed, unless the company can prove significant harm". So instead of the gov saying "email is ok!" you just get to use email, and then the company has to go to the gov and prove that you using email is a drain on their resources in order to fire you.