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 a

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.