I work at a large organization (thousands of individuals). I wonder what would happen if on July 1st I adopted a new email policy, that any non-encrypted email sent to me would be automatically deleted (and an automated reply sent to the sender, containing instructions for how to use PGP). I can't encrypt all email I'm sending out, unless I have the recipient's public key ... and if they don't use PGP then they won't have one ... and I can't exactly do it for them. I suppose I could send them an unencrypted email saying "I have a message for you, please send me your public key so I can encrypt it") but my guess is that they would simply ignore it if it involves more than 3 seconds of extra "work". My prediction is that probably it would have no effect, people would just behave as before and would start to complain that I don't respond to emails. So what would it take to get people --- not just at my company, but in the wider world --- to use encryption? Is there a single organization out there that everyone corresponds with, that could spark the change, if they abruptly (but with warning) adopted an encrypted-only policy? Maybe banks? Or governments (eg to file tax returns you need a public/private key pair)? Is there some way to gamify this so that there is an incentive for people to encrypt? What about a white-hat hacking approach whereby people are shown what is world-readable (and by whom) when they send email unencrypted? Gmail seems like an obvious entry point ... but it would go against their business model (they could no longer mine your emails). Is there any hope? I would still like to try my experiment ... but I also want to avoid becoming the tinfoil-hatted long-bearded crank of my organization.