I want a system where I can create destroyable email addresses, so when I sign up for something it creates a single channel, and if they resell that email address I can burn that channel.
Unfortunately `+alias`ing built into gmail is too easy to subvert as everything after the + can be removed and the email will still reach me.
Fastmail's "Masked Email" feature will do this. You can create unique addresses for services. And then you can deactivate them to block future emails arriving at that alias. And the aliases are random (couple of random words and some numbers e.g. busy.sock2881@fastmail.com ) so can't be externally linked back to the main address.
Unfortunately `+alias`ing built into gmail is too easy to subvert as everything after the + can be removed and the email will still reach me.