Private inboxes
No shared sandboxes
Create unique inboxes per test run or per user so messages never collide.
Switch from Mailtrap to programmable inbox APIs for CI
MailSlurp gives engineering and QA teams real inboxes on demand. Test sign-up, OTP, resets, invites, and notifications with deterministic wait APIs instead of shared sandboxes and flaky timing.
Deterministic waits
Stable CI suites
Wait for specific messages and assert on content without flaky sleeps and retries.
Webhooks + rules
Automation-ready
Trigger workflows on inbound email events and route results to your systems.
SDKs for teams
Fast onboarding
Integrate with JavaScript/TypeScript, Java, Python, Go, and more using maintained SDKs.
Core capabilities
What teams need when email workflows matter
Create real inboxes on demand for every test and environment
Provision inboxes at runtime for CI workers, staging, and automation so test data stays isolated and debuggable.
- Bulk create
- Isolation
- Parallel CI
Test OTP, magic links, and reset flows end-to-end
Extract links and codes, validate templates, and assert on complete message payloads with wait and search APIs.
- OTP
- Magic links
- Assertions
Parse HTML, headers, and attachments with one platform
Validate the content that breaks real user journeys: HTML, attachments, headers, and metadata.
- HTML
- Attachments
- Headers
Upgrade for retention controls, audit trails, and scale
Add retention controls, access rules, and clear visibility so email testing and automation stay easy to manage.
- Retention
- Audit trails
- Scale
Team use cases
How engineering, QA, and operations teams use MailSlurp
QA + release engineering
Deterministic inbox assertions in CI
Replace shared sandboxes with private inboxes and deterministic waits so suites are stable and failures are reproducible.
- Reduce flaky runs and false negatives
- Test parallel CI safely with isolated inboxes
- Debug failures using full message payloads
Product engineering
Staging validation for critical email journeys
Validate sign-up, billing, and notification workflows against real inbox behavior before release.
- Catch broken links and tokens early
- Verify templates and routing behavior
- Prevent regressions from reaching customers
Platform teams
Standardized inbox infrastructure across services
Use one API platform for inbox creation, waiting, parsing, and event-driven workflows across teams.
- Reduce mailbox tooling sprawl
- Speed up onboarding for new services
- Build reusable helpers and patterns
Getting started
Get this working quickly, then build on it
Day 1
Make one flaky email test deterministic
Pick a high-impact workflow and replace sandbox mailboxes and timing heuristics with inbox + wait APIs.
- Create an inbox during test setup
- Run the journey and wait for a specific message
- Extract a link/code and complete the flow
Week 1
Scale to your auth and onboarding suite
Add stable coverage for OTP, reset, invites, and notifications across your environments and CI pipelines.
- Add assertions for templates and key content
- Run in parallel with inbox-per-worker isolation
- Capture payloads for post-failure debugging
Week 2+
Standardize across teams and services
Create shared helpers and team standards so email testing and automation stays consistent and easy to manage.
- Share SDK wrappers and utilities
- Define retention and access rules
- Adopt webhooks for event-driven automation
Team fit
How different teams get value
QA teams
Challenge: Shared sandboxes and timing-based checks make email tests flaky and hard to debug.
What improves: Ship stable CI suites with deterministic waits and isolated inboxes.
Engineering managers
Challenge: Email regressions slip into production because automated validation is incomplete or unreliable.
What improves: Add dependable release gates for critical customer journeys.
Platform owners
Challenge: Multiple teams reinvent mailbox tooling and nobody owns the end-to-end workflow reliability.
What improves: Standardize inbox primitives and team standards across your organization.
Customer outcomes
What gets better once MailSlurp is in place
Higher CI reliability
Deterministic wait patterns reduce flaky runs and improve signal quality in pipelines.
Better coverage
Validate links, codes, templates, headers, and attachments in the workflows that drive revenue.
Faster debugging
Inspect message payloads directly instead of hunting through shared sandbox mailboxes.
Reusable primitives
Inbox APIs, waits, and webhooks are reusable across QA, staging, and automation workflows.
Ready to try this with your own workflow?
FAQ
Questions people ask before they start
Is this only for testing?
Many teams start with testing and then reuse the same inbox and webhook primitives for staging and automation workflows.
Can we run this in parallel CI?
Yes. Create isolated inboxes per worker so messages never collide and suites remain predictable.
Do you support attachments and HTML?
Yes. You can fetch HTML, parse headers, and download or assert on attachments and full payload details.
Will this work with Playwright, Cypress, or Selenium?
Yes. Use SDKs or REST APIs to create inboxes, wait for messages, and extract links or codes in any test runner.