Space Email is a Pay-What-You-Want web service. It is free to use, but there's much more. If you like Space Email, you should register. Beyond letting me keep the project going and develop newer, cooler stuff, registering will allow you to star messages so that they don't slip back out into space. You'll also be the first to know about cool new features.
By purchasing an account, you get
Purchase an account below. After you enter your PayPal information, click "Return to itch.io". There you can claim a key. Enter it here when you sign up for an account.