Inbox API
Create inboxes instantly
Provision inboxes per test, per user, or per environment without shared mailbox state.
Programmable inboxes for email testing and automation
MailSlurp helps engineering and QA teams ship reliable email workflows. Create inboxes on demand, wait for messages deterministically, extract links and codes, parse attachments, and stream inbound email events to webhooks.
Wait APIs
Deterministic tests
Wait for matching emails with explicit timeouts and assert on links, codes, headers, and attachments.
Inbound webhooks
Event-driven workflows
Stream inbound email to your services as JSON webhook events without running mail servers.
SDKs
Built for engineering
Integrate quickly with REST APIs and maintained SDKs across common stacks and CI tools.
Core capabilities
What teams need when email workflows matter
Email testing platform for CI and release gates
Replace flaky shared inboxes with isolated inboxes and deterministic waits for OTP, magic links, resets, invites, and notifications.
- CI
- OTP tests
- Release gates
Programmable inbox API for tests and automation
Create inboxes in bulk, search and parse messages, and reuse inbox primitives across staging and automation workflows.
- Inbox API
- Bulk create
- Search + parse
Inbound email webhooks to ingest messages and attachments
Receive inbound email events in real time and route messages into your systems with retries and observability.
- Webhooks
- Attachments
- Routing
Scale with retention controls and team workflows
Start free, then upgrade for scale, retention, policy controls, and visibility as your usage grows.
- Scale
- Retention
- Governance
Team use cases
How engineering, QA, and operations teams use MailSlurp
QA + SDET teams
Deterministic email tests in CI
Run stable inbox checks that gate releases and catch broken auth/onboarding flows before production.
- Reduce flaky failures from shared mailboxes and sleeps
- Extract links and codes reliably
- Debug failures with full payload inspection
Backend engineering
Inbound email ingestion without mail servers
Stream inbound messages to webhooks and process attachments and content safely with APIs.
- Ship event-driven ingestion fast
- Avoid inbox infrastructure maintenance
- Keep routing predictable with rules and policies
Platform and DevEx teams
Shared inbox primitives across teams
Standardize inbox workflows for QA, staging, and automation so teams onboard quickly and reuse the same patterns.
- Reduce tooling sprawl
- Improve ownership and auditability
- Make onboarding faster for new services
Getting started
Get this working quickly, then build on it
Day 1
Create one inbox and validate receipt
Provision a disposable inbox, trigger a real workflow email, and assert on the message content with deterministic waits.
- Create an inbox via the API or dashboard
- Trigger one workflow email (signup, reset, OTP)
- Wait for the email and assert on links or codes
Week 1
Add CI coverage for one critical journey
Turn a repeatable check into a regression gate in CI so broken email flows are caught before release.
- Add a test that provisions inboxes per run
- Store test evidence (payloads, screenshots, logs)
- Create a failure playbook for common issues
Week 2+
Scale across environments and teams
Expand coverage to onboarding, billing, alerts, and integrations, then standardize patterns across teams.
- Create inbox cohorts for staging and production checks
- Adopt webhooks for event-driven ingestion and routing
- Upgrade for retention controls and higher scale
Team fit
How different teams get value
Engineering and QA teams
Challenge: Email workflows break quietly and are hard to debug with shared mailboxes and sleeps.
What improves: Use isolated inboxes and deterministic waits to make email tests reliable and actionable.
Platform and DevEx teams
Challenge: Teams reinvent inbox tooling and build inconsistent approaches to inbound email and test data.
What improves: Standardize inbox primitives and webhook ingestion patterns across teams and environments.
Teams scaling usage
Challenge: As usage grows, retention, audit history, and access control become critical for reliability and compliance.
What improves: Upgrade for scale, retention controls, and visibility as workflows expand.
Customer outcomes
What gets better once MailSlurp is in place
Higher test reliability
Replace flaky time-based waits and shared mailboxes with deterministic inbox checks.
Faster debugging
Capture full payload evidence and inspect links, codes, headers, and attachments when tests fail.
Less inbox infrastructure
Avoid maintaining mail servers and ingestion pipelines by using webhooks and APIs.
Repeatable team-wide pattern
Start with one workflow and expand to a consistent email testing pattern across the team.
Ready to try this with your own workflow?
FAQ
Questions people ask before they start
Do I need to migrate everything at once?
No. Start with one workflow (for example sign-up or password reset) and expand coverage as you see reliability gains.
Does this work with parallel CI runners?
Yes. Provision inboxes per worker or per run so messages never collide across parallel builds.
Can I parse HTML and attachments?
Yes. You can fetch HTML/text bodies, headers, and download or assert on attachments and message metadata.
Can I use webhooks and also pull messages via API?
Yes. Many teams use webhooks for event-driven flows and APIs for inspection, replay, or backfill.