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I'm not sure what proportion of servers use TLS. I imagine a lot of mail would go missing if you started to require it though. IIRC, Google started publishing numbers somewhere.

The good thing about involving DNSSEC+DANE is that, even the first time an SMTP server connects to another, it knows that it must use TLS and must expect a particular certificate. With HSTS you don't get that protection on the first connection.

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I guess I would prefer that SMTP "skip over" the CA/DNSSEC model and go straight to something like HSTS+TACK to add the expectation of validity to the expected certs, rather than place trust in the DNSSEC roots.

I guess DANE (with or without DNSSEC) could also be used to cover the first connection, but I guess I'd prefer a world where the previous connection was used as the primary point of trust (the HSTS+TACK approach) rather than the "trusted root" (DNSSEC or CA).

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