Lyra1337/LyraMail — reverse-engineered prompt

Build me a simple temporary email web app like LyraMail. I want people to open the site, instantly get or choose a temporary mailbox, and receive emails there without signing up, logging in, or using cookies.

It should be clear that this is only for throwaway mail and not for important or sensitive messages. The app needs a clean web interface where users can see their inbox, open messages, refresh for new mail, and use the address easily. It also needs to actually receive incoming email through SMTP and show those messages in the browser.

Please make it easy to run locally and in Docker, with sensible configuration for domains, ports, storage, and cleanup of old mailboxes or messages. Keep it small and practical, using C# and a Blazor style web UI if that makes sense. Look up current docs online if you need to.