Instant inboxes
Provision at runtime
Create real inboxes per test, per user, or per environment without shared state.
Spin up test inboxes on demand with an Email Inbox API
MailSlurp gives your team instant inboxes for end-to-end tests, staging workflows, and inbound email automation. Create inboxes in bulk, wait for messages deterministically, and assert on content without relying on shared mailboxes.
Wait + search
Deterministic assertions
Wait for messages, search content, and avoid flaky timing-based test failures.
SDKs
Drop-in for CI
Use JavaScript/TypeScript, Java, Python, Go, and more to integrate quickly.
Webhooks
Automation-ready
Trigger workflows on new email, attachments, or delivery events with webhooks and inbox-native routing patterns.
Core capabilities
What teams need when email workflows matter
Create inboxes in bulk for parallel tests
Generate many inboxes at once so parallel test runs stay isolated and reliable across CI workers.
- Bulk create
- Isolation
- Parallel CI
Wait for specific messages without flakiness
Use wait and search APIs to assert on OTPs, verification emails, password resets, and notifications reliably.
- Wait for email
- Search
- Assertions
Parse email content and attachments with one API
Extract links, tokens, attachments, and headers so tests and services can validate the full message payload.
- HTML + text
- Attachments
- Headers
Move from tests to production workflows when needed
Keep the same inbox primitives for staging and production automation, with retention controls, routing, and clear visibility.
- Retention controls
- Audit history
- Scale
Team use cases
How engineering, QA, and operations teams use MailSlurp
QA + release engineering
Email flows in CI and end-to-end tests
Test sign-up, login links, OTPs, password resets, invites, and notifications using isolated inboxes.
- Reduce flaky failures from shared mailboxes
- Increase confidence in release gating
- Validate message content, links, and attachments
Engineering
Staging and sandbox inbox infrastructure
Provision inboxes per environment so teams can reproduce workflows without polluting production mailboxes.
- Keep staging mail flows realistic and testable
- Avoid managing disposable inbox providers manually
- Standardize inbox patterns across teams
Automation owners
Webhook-driven routing and automation
Trigger jobs from inbound messages and route results into finance, support, and operations systems without polling.
- Turn inbound email into structured events
- Automate inbox workflows across services
- Reduce operational overhead for email-heavy workflows
Getting started
Get this working quickly, then build on it
Day 1
Replace one flaky test flow
Pick one high-value test flow (sign-up, reset, OTP) and make it deterministic with isolated inboxes and waits.
- Create an inbox in the test setup
- Run the flow and wait for the expected message
- Assert on links/tokens and complete the user journey
Week 1
Scale to parallel CI runs
Provision inboxes per test worker and run email suites in parallel without shared mailbox contention.
- Bulk create inboxes per CI worker
- Add search assertions for key message variants
- Capture failures with message payload snapshots
Week 2+
Adopt inbox primitives across teams
Standardize inbox patterns across QA, engineering, and operations to reduce duplicated tooling and inconsistent workflows.
- Create reusable inbox helpers and SDK wrappers
- Define retention and access rules for inbox lifecycle
- Add webhooks for automation use cases when needed
Team fit
How different teams get value
QA leads
Challenge: Email tests become flaky when teams share inboxes and rely on timing heuristics.
What improves: Use isolated inboxes and deterministic waits for stable CI pipelines.
Engineering managers
Challenge: Ad-hoc inbox tooling creates maintenance overhead and inconsistent test coverage.
What improves: Standardize email testing and inbox automation on one platform.
DevOps and release owners
Challenge: Release gates are unreliable when email workflows are hard to validate in automation.
What improves: Add deterministic inbox checks that scale to parallel builds.
Customer outcomes
What gets better once MailSlurp is in place
Fewer flaky failures
Replace timing-based waiting and shared inboxes with deterministic APIs designed for test orchestration.
Faster debugging
Capture message payloads and attachments so failures are actionable without manual mailbox inspection.
Better release confidence
Gate releases on real inbox flows for the journeys that matter most to customers.
Reusable primitives
One inbox API supports testing, staging, and automation workflows without re-architecting later.
Ready to try this with your own workflow?
FAQ
Questions people ask before they start
Is this only for disposable inboxes?
No. You can use disposable or persistent inboxes, custom domains, and inbox pools depending on your workflow.
Does this work with parallel test runners?
Yes. Provision inboxes per worker and keep test runs isolated so messages never collide.
Can we test attachments and rich HTML emails?
Yes. MailSlurp supports parsing HTML, text, headers, and attachments so you can validate complete payloads.
Do you have SDKs for common languages?
Yes. MailSlurp supports JavaScript/TypeScript, Java, Python, Go, PHP, and more.