Firefox has Firefox Relay, which lets you create aliases (they call them masks) for one destination email for free

https://relay.firefox.com/

You’re missing the essential element of this thought experiment - the poison gas canister in the box which releases the gas when an atom decays. That atomic decay is a quantum event that cannot be predicted even if one has perfect knowledge of the atom concerned, and in fact whether it has actually decayed or not only becomes real when it is measured ie observed. Thus, according to this experiment, the cat is simultaneously alive and dead at once, up until the box is opened and an observation made.

If you don’t have that atomic decay, then the cat’s health is merely unknown - it is either alive or dead, not both at once, but the scientist simply doesn’t know which.