product
Temp Email Generator With Inbox API for Developers and QA
Generate temporary email addresses with private inbox APIs. Create inboxes on demand, receive real messages, and automate test assertions in CI.
MailSlurp gives you a temp email generator backed by a real inbox API, so you can test and automate email workflows without sharing public inboxes.
Quick answer
You can create inboxes per user, per test run, or per environment, then receive and assert real messages through API calls and SDKs.
This is the fastest way to make signup, reset, OTP, and billing emails deterministic in CI.
What this product is for
Use the inbox API when your team needs:
- on-demand temporary addresses
- receive-side assertions in automated tests
- private inbox access controls
- lifecycle management (expire, delete, retain)
- attachment/link/token extraction from messages
Core capabilities
Inbox provisioning
- create disposable or persistent inboxes
- assign tags/names for workflow ownership
- isolate by branch, suite, or customer journey
Message retrieval and wait primitives
- wait for first/latest/matching email
- filter by subject, sender, and unread status
- retrieve raw content, headers, and metadata
Workflow automation hooks
- webhook integration for event-driven pipelines
- send + receive support in one API surface
- SDK support across major languages
Governance controls
- API key-based access
- predictable cleanup and expiration policies
- dashboard visibility for debugging failed runs
Architecture pattern
[Test or app action] -> [MailSlurp inbox API] -> [Inbox] -> [Wait/assert API] -> [Pass/fail signal]
This pattern lets release gates depend on actual message outcomes, not just send-attempt logs.
Example: temp inbox lifecycle in tests
const inbox = await mailslurp.createInbox({ expiresIn: 20 * 60 * 1000 });
await app.triggerPasswordReset({ email: inbox.emailAddress });
const email = await mailslurp.waitForMatchingFirstEmail({
inboxId: inbox.id,
timeout: 30000,
subject: "Reset your password",
});
expect(email.body).toContain("/reset");
Comparison: public temp mail vs private inbox API
| Approach | Works for | Limitation |
|---|---|---|
| Public temp mail | ad hoc manual checks | weak isolation and poor CI determinism |
| Private inbox API | QA automation and integration testing | requires initial setup |
Recommended starting point
- Start with one critical journey (signup or password reset).
- Add per-run inbox isolation in your CI pipeline.
- Add receive-side assertions for subject, link, and token behavior.
- Expand to billing, alerts, and transactional templates.
- Add recurring deliverability checks for production confidence.
Related routes
- Dummy email address guide
- Temporary email
- Disposable email API
- Email Sandbox
- Email integration testing
- Messaging webhooks
- Team mailboxes
- Email auto-reply
FAQ
Is this free?
MailSlurp includes a free tier so teams can validate workflows before scaling usage.
Are generated inboxes real inboxes?
Yes. Messages are genuinely delivered and retrievable via API and dashboard.
Can I use this for production monitoring too?
Yes. Many teams start in QA and later add synthetic production checks for critical communication flows.
Final take
A temp email generator is only valuable when inbox behavior is controllable. MailSlurp's inbox API gives that control and turns email from a flaky dependency into a testable system boundary.