On: ProtonMail now offers elliptic curve cryptography

[Slippery_John]

You can use catchall addresses for this. Any ol email @ that domain that doesn't have an associated account gets routed to the catchall account. Protonmail supports this if you pay, as do a few others.

[jszymborski → Slippery_John]

beware the spam that comes with this... you'll want to block sales@example.com, etc...