testmail.app

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Introduction

testmail.app gives you unlimited email addresses and mailboxes for automating end-to-end tests through simple APIs. Send test emails to {namespace}.{tag}@inbox.testmail.app; each tag creates a separate mailbox, so you can create addresses on the fly by changing the tag and never spam real customers by mistake.

It receives, parses, spam-tests and indexes emails for retrieval via a simple JSON API or a GraphQL API. Paid plans allow temporary usage surges without cutting off CI pipelines.

Email flows such as sign-up confirmation, password reset and magic links are common E2E blind spots; a disposable inbox API makes them testable.

Features

1. Unlimited addresses: Tags create mailboxes.
2. JSON API: Simple retrieval.
3. GraphQL API: Powerful queries.
4. Spam testing: Spam checks on mail.
5. Surge tolerance: No hard cut-offs on paid plans.

Pros

1. Free forever plan: Start at $0.

Cons

1. Receive-focused: Not an SMTP sandbox for your own server.

Usage and Links (Example)

1. Sign up to get your namespace.
2. Use {namespace}.{tag}@inbox.testmail.app in your E2E test.
3. Query the API for the email and assert on its content.

Resources:

• testmail.app website

Pricing

testmail.app has a free forever plan and paid plans at $9, $29, $89 and $269 a month billed annually ($12, $39, $129 and $299 monthly), plus enterprise contracts.

Recommended for?

1. E2E testers covering sign-up and password-reset emails.

Conclusion

testmail.app is a simple, affordable inbox API for tests.

Use unique tags per test run.

On CheckOps, testmail.app is filed under the End-to-end & functional and Integration testing stages. Related tools listed here include Mailosaur, Mailtrap, Mailpit, Playwright, Cypress and Moto. A short trial on a real project, with your own code, data and pipeline, is usually the fastest way to choose between them, because fit matters more than feature lists. Facts here come from the official site, documentation and repository, checked on 11 November 2026.