[davidandgoliath]

And container escape exploits are getting burned by sending them out via email? Doubtful.

[Syonyk]

It depends on who you're targeting and what you want.

But the history of computers security can largely be summed as:

"What? You're just paranoid. Nobody would possibly X!"

Someone gets their asses handed to them by someone Xing.

"What? Why didn't you tell us X was a risk we needed to be concerned about???"

Iterate.

[adgjlsfhk1]

well if you bother to send an email that breaks out of the container, you might as well make it retrospectively delete the email to hide the evidence :)