Before you send
The message is stored in this site's own database and read only by the person who runs it. It does not pass through any third-party service. Even so, do not put passwords, card numbers or anything you would not write in an email.
A reply address is optional. Leave it blank and the message still arrives — there just is no way to answer it.
Asking for an account to be deleted? Sign in first and the request will carry your account automatically, so it can be verified. Otherwise write the email address you signed up with.