Test Data — entry 010 of 19
Mailsac
Mailsac is a disposable-email API built for QA and integration testing — create or reserve inboxes, fetch, search, and delete received messages as JSON (or raw/text/HTML), validate whether an address belongs to a known disposable-email domain, and stream new mail over WebSocket instead of polling. Its full surface — confirmed live via GET requests against mailsac.com/api that correctly return 401 for unauthenticated calls — requires an API key sent via header or query param, and is published as an open OpenAPI 3.0 spec browsable through both Redoc and Swagger UI. A free Basic plan covers typical single-project test automation, with paid Indie, Business, and Enterprise tiers raising message-volume and privacy limits.
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<a href="https://greatapis.com/api/mailsac/"><img src="https://greatapis.com/badge/mailsac.svg" alt="Scored 67 on greatapis.com"></a>Auth quickstart
- Sign up with the provider to get an API key.
- Send it on every request as a header
Authorization: <key> - The exact header isn't documented — Authorization is a common default; confirm in the provider's docs.
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.