Inbox-per-run
Parallel by default
Provision unique inboxes per worker so CI runs stay isolated and reliable.
Scale automated email testing with API-first inboxes
MailSlurp gives teams programmable inbox infrastructure for end-to-end tests and automation. Provision inboxes per run, wait for messages, extract links and codes, and keep email testing reliable as you scale.
Wait + search
Deterministic checks
Wait for specific emails and validate content, links, and tokens without flakiness.
Parsing depth
Full payload access
Parse HTML, headers, and attachments and validate the exact content your users receive.
Developer-first
SDKs + docs
Integrate quickly using REST APIs and SDKs across modern stacks and CI workflows.
Core capabilities
What teams need when email workflows matter
Create inboxes in bulk for large test suites
Generate inboxes for many tests at once and keep your suite stable across parallel workers and environments.
- Bulk create
- Isolation
- CI workers
Test OTP and auth flows end-to-end
Extract codes and magic links, validate templates, and assert on message timing with reliable APIs.
- OTP
- Auth flows
- Assertions
Parse emails, attachments, and routing metadata
Validate the parts that break onboarding and billing: links, attachments, headers, and message metadata.
- Attachments
- Headers
- HTML
Move beyond tests with retention controls and automation
Keep inbox workflows organized with retention controls, access rules, and automation through webhooks.
- Retention
- Access control
- Webhooks
Team use cases
How engineering, QA, and operations teams use MailSlurp
QA + test automation
Reliable end-to-end coverage for email journeys
Test sign-up, reset, invites, notifications, and billing emails using deterministic waits and content assertions.
- Reduce flaky failures and retries
- Increase confidence in release gates
- Validate links, tokens, and templates reliably
Engineering teams
Staging validation that matches production behavior
Provision realistic inbox behavior in staging so engineers can reproduce workflows without shared mailboxes.
- Make regressions reproducible and debuggable
- Keep environments isolated and clean
- Standardize test inbox patterns across services
Platform owners
Shared inbox infrastructure for the organization
Provide one inbox API layer for teams and maintain shared standards, retention settings, and automation patterns centrally.
- Reduce duplicate tools and vendor sprawl
- Improve auditability and ownership
- Scale with shared primitives and operating standards
Getting started
Get this working quickly, then build on it
Day 1
Automate one critical email flow
Start with a high-impact flow and replace timing heuristics with inbox + wait APIs.
- Create an inbox during test setup
- Trigger the email journey
- Wait for the email and extract links or codes
Week 1
Scale to parallel CI workers
Provision inboxes per worker and isolate data so suites run predictably at speed.
- Bulk create inboxes per worker
- Add content and payload assertions
- Capture messages to debug failures quickly
Week 2+
Standardize across your product and teams
Create reusable helpers and shared standards to keep testing and automation consistent.
- Share SDK wrappers and fixtures
- Define retention and access rules
- Adopt webhooks for event-driven automation
Team fit
How different teams get value
Test automation engineers
Challenge: Email tests are fragile and slow when shared inboxes and timing heuristics are involved.
What improves: Run deterministic suites with inbox-per-run isolation.
Engineering leaders
Challenge: Regressions in onboarding and auth flows create incidents and support load.
What improves: Add stable release gates for critical messaging workflows.
Platform and DevEx teams
Challenge: Multiple teams need inbox infrastructure but nobody owns standards, retention, and visibility.
What improves: Centralize primitives and policies with one API platform.
Customer outcomes
What gets better once MailSlurp is in place
Less flakiness
Deterministic waits and isolated inboxes reduce false failures in CI.
Faster shipping
Stable automation reduces rework and speeds up release cycles.
Implementation-grade APIs
SDKs, webhooks, and payload parsing make it easy to integrate into real test suites.
Enterprise-ready
Retention controls, audit history, and team access support regulated and large-scale teams.
Ready to try this with your own workflow?
FAQ
Questions people ask before they start
Can we use this with any test runner?
Yes. Use REST APIs or SDKs to create inboxes, wait for emails, and extract links or codes from any test framework.
Does this work in parallel CI?
Yes. Create inboxes per worker or per run so messages never collide across parallel pipelines.
Can we validate HTML and attachments?
Yes. Parse HTML, headers, and attachments and assert on full payload details.
Do we need to switch our whole stack?
No. Start with one workflow and expand coverage as you see reliability gains.