No, they couldn't. What they could do--and what they did do--was push for the move of TLS connections for the MX-MX hop of email; I don't have the stats off the

No, they couldn't. What they could do--and what they did do--was push for the move of TLS connections for the MX-MX hop of email; I don't have the stats off the top of my head for how prevalent that is, but I think it's in the 80-90% range of email being delivered in this method. But end-to-end encrypted email? It breaks everything. You need to get all the MUAs to support it (very few do either S/MIME or PGP). You'll break webmail--the most popular way to use email--without lots of major investment. And encrypted email breaks things like spam filtering or server-side filters catastrophically. Key discovery is also unsolved. There was a time when I was on the everybody-should-use-encrypted-email train. But I've since grown up and realized that encrypted email fundamentally breaks email in ways that people are unprepared for, and people have already figured out how to route around the insecurity of email via other mechanisms.