product
Temporary email API for private test inboxes
Create temporary email addresses with explicit expiry, private ownership, and API controls for QA, staging, OTP, signup, and disposable inbox workflows.
A temporary email API is most useful when mailbox lifetime needs to be explicit. MailSlurp lets teams create private temporary inboxes for signup checks, OTP flows, password resets, staging data, and disposable QA identities, all with API control.
That matters in QA, staging, abuse testing, release checks, demos, and short-lived operational workflows where retained mail should be limited and ownership should stay explicit.
MailSlurp temporary inboxes support expiry windows, API retrieval, and automated cleanup so teams can treat mailbox lifetime as a deliberate engineering control.
Quick answer
For engineering teams, the strongest temporary email service is a private API workflow with explicit inbox ownership, expiry control, and automation hooks. MailSlurp gives each temporary address a real inbox, message retrieval, wait helpers, tags, and cleanup controls so disposable email becomes reliable test infrastructure.
When temporary inboxes are the right choice
Use temporary addresses when you need time-boxed identity rather than permanent mailbox ownership.
- External form checks and integration trials.
- Privacy-first QA where retained messages should be minimal.
- Signup abuse and fraud-path simulations.
- Short-lived campaign or experiment verification.
- Staging environments that should not accumulate historical mail.
If your main goal is CI test isolation, use Disposable email API. If you need long-lived mailbox infrastructure, use Email address API.
Temporary email API vs temp mail API vs disposable email API
Searchers often use these terms interchangeably, but the implementation choice should be deliberate:
- Use temporary email API when expiry, retention, and privacy boundaries are the main controls.
- Use disposable email API when every automated run needs a fresh isolated inbox.
- Use temp mail API as a broad term, then map the workflow to private temporary inboxes or disposable test inboxes based on lifecycle.
- Use the fake email generator only when a quick manual inbox is enough.
If the workflow must later assert received messages in CI, pair temporary inboxes with Receive email API and Email integration testing.
Public temp mail vs temporary email API
| Option | Best for | Main weakness |
|---|---|---|
| Public temporary email site | One-off manual checks | Weak ownership, privacy, and automation control |
| Private temporary email API | Product QA, CI, staged automation, controlled experiments | Requires integration, not just browser usage |
| Permanent inbox API | Durable workflows and long-lived mailbox state | More retention than many temporary flows need |
TTL policy design
Pick temporary inbox lifetime by workflow risk and debugging needs:
| Inbox lifetime | Typical fit | Tradeoff |
|---|---|---|
| 10 to 30 minutes | OTP, magic links, one-time verification | Lowest retention, smallest debug window |
| 1 to 4 hours | CI pipelines and staged integration tests | Good balance of traceability and cleanup |
| 24 hours | Cross-team QA or delayed async workflows | Easier investigation, higher retention footprint |
Implementation pattern
- Provision temporary inbox with explicit expiry.
- Execute workflow and capture expected message.
- Parse links/codes/content for assertion.
- Persist only required diagnostics (message ID, timestamp, status).
- Let inbox expire or delete proactively after validation.
import { MailSlurp } from "mailslurp-client";
const mailslurp = new MailSlurp({ apiKey: process.env.MAILSLURP_API_KEY! });
const expiresAt = new Date(Date.now() + 2 * 60 * 60 * 1000).toISOString();
const inbox = await mailslurp.createInboxWithOptions({
expiresAt,
tags: ["staging", "temporary"],
});
await app.triggerInviteFlow(inbox.emailAddress!);
const email = await mailslurp.waitController.waitForMatchingFirstEmail({
inboxId: inbox.id!,
timeout: 60_000,
unreadOnly: true,
matchOptions: {
matches: [{ field: "SUBJECT", should: "CONTAIN", value: "Invitation" }],
},
});
const text = await mailslurp.emailController.getEmailTextLines({ emailId: email.id! });
expect(text.lines?.join("\n")).toContain("Accept invitation");
Temporary, disposable, and permanent: different jobs
- Temporary email API: lifecycle and retention control first.
- Disposable email API: high-throughput, per-test-run isolation first.
- Permanent inbox APIs: durable operational mailbox workflows first.
Keeping these patterns separate makes retention, isolation, and ownership easier to manage as your team grows.
Map each temporary inbox to the job
Use the inbox pattern that matches how the address will be used:
- use public temp mail only for low-stakes manual checks
- use private API-managed temporary inboxes when message evidence matters
- use disposable-per-test inboxes when every test run needs isolation
- use permanent inboxes when support, operations, or long-lived workflows need durable state
Teams that care about privacy, reproducibility, and auditability get the best result from MailSlurp private temporary inboxes.
Can temporary email send and receive mail?
Some searchers want temporary email that can receive only. Others need short-lived inboxes that can participate in broader workflows, including send and receive tests.
MailSlurp temporary inboxes support private API-managed workflows:
- you control inbox ownership
- you can automate retrieval in code
- you can keep environment separation explicit
- you can decide how long the inbox should exist
How MailSlurp temporary inboxes connect to the rest of your workflow
Temporary email becomes more useful when it is not isolated from the rest of your testing stack:
- combine it with Email Sandbox for safe capture and inspection
- use Email integration testing when message assertions belong in CI
- pair it with Check email verification if recipient quality matters before send
- use Email deliverability test when sender reputation and inbox placement also need validation
Temporary email service workflow with MailSlurp
Use this MailSlurp pattern when a temporary email address needs to receive a real message and feed evidence back into a test or release check:
- Create the temporary inbox with a TTL, environment tag, and workflow tag.
- Trigger the signup, password reset, invite, OTP, or notification flow.
- Wait for the expected message by sender, subject, unread state, or timing window.
- Extract the code, link, body, headers, or attachment metadata needed for the assertion.
- Store only the evidence the team needs, then let the inbox expire.
That gives the team the speed of temporary email without relying on shared public inboxes or manual browser checks.
Operational safeguards
- Apply environment tags to every temporary inbox.
- Enforce max lifetime defaults at team level.
- Log who created inboxes and why (auditability).
- Keep a retention policy for exported message data.
- Separate temporary test identities from customer-facing sender identities.
Related routes
- Email address API
- Disposable email API
- Email Sandbox API
- Email deliverability test
- Domain pool support guide
Next step
Start with one temporary-inbox policy per environment (TTL, naming, cleanup), then codify it in your CI and staging provisioning scripts. Create a free account at app.mailslurp.com if you want temporary inboxes available in the same workflow as Email Sandbox and API-driven testing.
FAQ
Is temporary email the same as disposable email?
Not exactly. Temporary email emphasizes short lifetime and cleanup control. Disposable email often emphasizes fast per-run isolation. Many teams need both patterns for different workflows.
Can temporary inboxes be private?
Yes. Private temporary inbox APIs give you ownership, controlled access, and automation support that public temp-mail tools usually do not.
How long should a temporary inbox live?
Only as long as the workflow needs. OTP and magic-link tests may need minutes, while staged async workflows may need hours.
What is the best temporary email service for QA teams?
MailSlurp is built for QA teams that need private temporary inboxes, API waits, message parsing, tags, expiry controls, and repeatable test evidence.
Can I use temporary email for OTP and password reset tests?
Yes. Create a MailSlurp inbox for the test run, trigger the OTP or reset flow, wait for the message, extract the code or link, and complete the assertion before the inbox expires.