Think of this like sharing a secret word with a friend so they can unlock a message you sent them. With Cloudstar’s sender set passphrase, the person sending the email creates a password and shares it with the recipient separately—this way, the recipient doesn’t need to register or sign up for anything. It’s a quick and simple way to securely share sensitive information while keeping control over who can see it. This approach is especially useful for one-time or occasional secure communications and still supports compliance by protecting the message with a strong password.