mailfixture

mailfixture creates real test inboxes in a single API call to streamline automated testing. When your application sends transactional emails like OTPs, the service receives, parses, and delivers the data to your test suite in a typed format. Instead of sleeps and regexes, tests long-poll an endpoint that answers the moment mail arrives: the OTP comes back ranked and scored, links arrive classified (verify, reset, unsubscribe), and every message carries SPF/DKIM/DMARC verdicts plus a SpamAssassin score - so one assertion covers content, authentication, and spamminess. An inbox per test makes parallel suites race-free, and TTLs clean up after crashed runs. JS/TS and Python SDKs wrap the REST API; everything else uses plain HTTP. Dedicated US phone numbers extend the same loop to SMS OTPs, and a remote MCP server gives AI agents the identical tools ("create inbox, sign up, read the code") in single tool calls. Custom domains put inboxes on infrastructure you control, out of reach of disposable-email blocklists. mailfixture is receive-only by design - it never sends a message - with flat pricing that counts messages, not seats.