9Mail.xyz - Free temporary email. No signup, no password

Hi everyone, I'm Pim, the maker of 9Mail.xyz. I wanted a quick way to get a throwaway address for one-off signups without making yet another account. So I built a site that gives you a temporary inbox as soon as you open it. You don't need an account or a password, and you can pick from several domains. The inbox is receive-only and expires after about 60 minutes. It is not meant for banking, health or other sensitive accounts. The site is in English and Indonesian. For developers, there is a page on using throwaway inboxes in signup, verification and password-reset tests. There is also a developer API in private beta. I'd like your honest feedback: what is missing, what is confusing, and what would make you come back?