stg-email
A simple solution for testing emails before going into production.
Point a staging environment at a throwaway inbox and read what it actually sends. You add an inbox, the app polls the mail API for it, and messages render in a list or full-page view; enough to check a template or a signup flow without wiring a real mailbox into staging.
The frontend is a static SvelteKit project talking to a small hosted mail API, Inboxes are identified by a credential pair kept client-side rather than by an account system.