Auth-state ready
Per spec or worker
Generate unique email addresses for setup projects, worker fixtures, and clean account state.
Make Playwright email assertions deterministic and parallel-safe
MailSlurp provisions disposable inboxes and reliable wait helpers so Playwright suites can create unique users, store clean auth state, and verify sign-up, password reset, and MFA email steps without shared mailboxes or flaky sleeps.
Works with your QA stack
Trusted by teams at
Used by engineering, QA, lifecycle, and operations teams building and testing email and SMS workflows.
Deterministic waits
Reliable CI
Wait for matching emails and extract the exact links or codes you need to proceed.
HTML + attachments
Production coverage
Validate customer-facing content including templates, headers, and attachments.
Scale coverage
Parallel runs
Run Playwright across many workers without mailbox collisions or brittle cleanup.
Core capabilities
Playwright integration capabilities teams can act on
Provision inboxes for Playwright auth setup
Create real inboxes per setup project, test run, or worker so Playwright flows start with clean user identity and reusable authenticated state.
- Auth setup
- Parallel-safe
- Clean fixtures
Wait for emails and extract OTP codes or links
Use deterministic wait helpers to find the right message and parse codes, anchors, and links before saving or reusing authenticated browser state.
- OTP codes
- Magic links
- Reset links
Assert on content that matters
Validate HTML rendering, links, headers, and attachments to catch real customer-facing regressions.
- HTML parsing
- Attachments
- Header checks
Stabilize release gates in CI
Turn manual email checks into automated regression gates and ship with confidence every release.
- CI
- Evidence
- Fast diagnosis
Team use cases
Ways teams use MailSlurp for Playwright integration
QA automation engineers
Verify email steps in sign-up and authentication setup
Test the full customer journey by asserting on real inbox messages while building Playwright auth setup and worker fixtures.
- Capture verification links and OTP codes
- Reduce flaky failures from timing and shared inboxes
- Prove onboarding flows before release
Platform and DevEx teams
Provide shared Playwright email helpers
Standardize inbox provisioning and wait patterns so teams ship reliable tests faster.
- Enable parallel Playwright workers safely
- Reduce test glue across repositories
- Create a consistent failure playbook
Security and compliance stakeholders
Validate MFA and notification workflows
Test security-critical email flows like MFA and account alerts with deterministic assertions.
- Catch broken MFA messages early
- Validate templates and links across environments
- Improve auditability of release checks
Getting started
Make the first workflow useful quickly
Day 1
Add one real inbox assertion to Playwright auth setup
Start with one critical workflow and validate the email step with deterministic waits before the suite reuses authenticated state.
- Provision a disposable inbox per spec run
- Trigger a workflow email (signup, reset, MFA)
- Wait for the email, extract the code or link, and save clean auth state
Week 1
Make the pattern parallel-safe and reusable
Use inboxes per worker and store evidence so failures are actionable in CI.
- Provision inboxes per worker to avoid collisions
- Store payload evidence on failures
- Add assertions for HTML, headers, and attachments
Week 2+
Scale coverage across workflows and teams
Expand to more templates and notification flows as coverage grows.
- Standardize fixtures and helper libraries
- Add alerts for regression failures
- Upgrade for higher volume and team workflows
Team fit
Where teams get value
Teams adopting Playwright at scale
Challenge: Email workflows are often excluded from suites because inbox handling is flaky and slow to debug.
What improves: Add real inbox assertions so Playwright tests cover the full customer journey.
Parallel CI teams
Challenge: Shared mailboxes create collisions and non-deterministic failures across workers.
What improves: Use disposable inboxes and deterministic waits to keep runs stable.
Enterprise programs
Challenge: Incidents happen when critical notifications are not gated and validated during release.
What improves: Gate releases on deterministic email checks with evidence.
Customer outcomes
What improves after the first workflow
Deterministic assertions
Wait for matching emails and extract links/codes without sleeps and retries.
Parallel-safe execution
Provision inboxes per worker so Playwright scales across CI pipelines cleanly.
Production-grade coverage
Validate templates, links, headers, and attachments that customers rely on.
Clear upgrade path
Start free, then scale volume, retention, and team access when coverage grows.
Ready to try this with your own workflow?
FAQ
Common questions before starting
Does this work with parallel Playwright workers?
Yes. Provision inboxes per worker or per run so messages never collide across parallel builds.
Can we test OTP and MFA email steps?
Yes. Teams commonly extract OTP codes and magic links from emails and complete flows end-to-end in Playwright.
Can this support Playwright authentication storage?
Yes. Use MailSlurp during setup or worker fixtures to create unique accounts, receive verification emails, complete login, and save clean authenticated state.
Can we validate HTML rendering and attachments?
Yes. You can parse HTML/text bodies and download attachments to validate customer-facing output.
Do you support multiple languages for Playwright?
Yes. Many teams use MailSlurp APIs from JavaScript/TypeScript, Python, Java, and other stacks depending on their test harness.