Mailosaur is very easy to integrate into automated testing workflows, especially with Playwright. It helps us reliably validate emails, OTP codes, magic links, and notifications during CI runs without flaky workarounds. The API is simple, inbox creation is fast, and debugging failed email tests became much easier for our team.

I enjoy how inexpensive it is - it was very easy to set up and get testing, as well.

We piloted Mailosaur to solve a specific, painful problem: our CIAM magic-link sign-in flow needs an automated test to receive a real Firebase email, extract the one-time code, and complete the round-trip — all without a human clicking a link. The two things that made it work for us: 1. **Real HTTP/SDK access.** Our prior tooling was a screen-scraped public inbox, which meant any API-tier regression that needed the email body had to fall back to a UI runner. With Mailosaur we drove the same flow from Loadmill (REST), Postman/Newman (REST), and Playwright (the Node SDK) — same backend, three layers of test coverage, no UI scraping. 2. **Per-run inbox isolation under one server domain.** Being able to mint a fresh local-part on demand under `*@<serverId>.mailosaur.net` killed the entire class of flake we'd been fighting where the "newest email" heuristic would pick up a leftover from a prior run. The `receivedAfter` filter on the search/get APIs cleanly enforces it. Wall-clock was also a quiet win — the new-customer magic-link flow ran ~30s end-to-end on Mailosaur vs ~42s on the previous tooling.