Why is it asking for my email?
The sender restricted who can open this.
What happens
You enter your address, we send a six-digit code, and the code unlocks the secret for you. The sender sees that the address they allowed is the one that opened it.
What we do not do
We never ask for a password, we do not create an account for you, and we do not add you to anything. The address is kept with the sender's receipt and purged with it.
Still stuck? Contact support, or send a secret of your own.