Disposable inboxes
Per run
Generate unique email addresses per suite for isolation and clean fixtures.
Make WebdriverIO email assertions deterministic and parallel-safe
MailSlurp provisions disposable inboxes and provides reliable wait helpers so WebdriverIO suites can 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 links or OTP codes without brittle sleeps.
HTML + attachments
Production coverage
Validate templates, links, headers, and attachments to catch real regressions.
Parallel-safe
Scale coverage
Run WebdriverIO across many workers without mailbox collisions or cleanup pain.
Core capabilities
WebdriverIO integration capabilities teams can act on
Provision inboxes on demand for isolated runs
Create real inboxes per run so WebdriverIO flows always have a clean, unique user identity.
- Disposable inboxes
- 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 reliably.
- OTP codes
- Magic links
- Reset links
Assert on content that matters
Validate HTML rendering, links, headers, and attachments to improve release confidence.
- 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 WebdriverIO integration
QA automation engineers
Verify onboarding and authentication emails in WebdriverIO
Test the full customer journey by asserting on real inbox messages in your suite.
- 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 inbox helpers for test frameworks
Standardize inbox provisioning and wait patterns so teams ship reliable tests faster.
- Enable parallel workers safely
- Reduce test glue across repositories
- Create consistent failure evidence
Release managers
Gate releases on critical email workflows
Convert manual spot checks into automated regression gates that run on every deployment.
- Catch broken templates before customers do
- Shorten incident response with clear evidence
- Increase confidence in staged releases
Start testing
Start previewing customer emails quickly
Day 1
Add one inbox assertion to a critical test
Start with the highest-impact workflow and validate email receipt plus one key assertion.
- Create a disposable inbox during the run
- Trigger a real workflow email from the app
- Wait for the email and extract the code or link
Week 1
Make tests parallel-safe and add evidence
Turn the first workflow into a reusable pattern across workers and pipelines.
- Provision inboxes per worker
- Store payload evidence on failure
- Add assertions for HTML, headers, and attachments
Week 2+
Scale coverage across teams
Expand patterns to more workflows and standardize how failures are debugged.
- Create shared helpers for inbox and wait logic
- Add monitoring around workflow failures
- Upgrade for higher volume, retention, and team access
Customer use cases
Where MailSlurp helps
Teams running parallel CI
Challenge: Shared inboxes and time-based sleeps cause flaky tests and non-deterministic failures.
What improves: Use disposable inboxes and deterministic waits to keep suites reliable under load.
QA teams shipping weekly
Challenge: Email steps break quietly and manual verification does not scale with release cadence.
What improves: Automate email assertions inside WebdriverIO so regressions are caught before deploy.
Enterprise release stakeholders
Challenge: Production incidents happen when critical messaging workflows are not gated with evidence.
What improves: Turn email workflows into regression gates with clear payload evidence.
Better email releases
What gets easier before send time
Fewer flaky failures
Replace sleeps and shared mailboxes with deterministic inbox waits and isolation.
Faster debugging
Inspect email payloads, links, headers, and attachments when tests fail.
Parallel-safe by design
Run many workers without mailbox collisions or fragile cleanup logic.
Clear upgrade path
Start free, then scale volume, reporting, and team access as coverage expands.
Ready to test your next email?
FAQ
Common questions before starting
Can we run WebdriverIO tests with parallel workers?
Yes. Provision inboxes per worker or per run so messages never collide across parallel builds.
Can we test password reset and account verification flows?
Yes. Teams commonly assert on OTP codes, magic links, and reset links in sign-up and auth workflows.
Can we parse HTML and download attachments?
Yes. You can fetch HTML/text bodies, headers, and attachments to validate real customer content.
Is this limited to JavaScript?
MailSlurp supports multiple SDKs and languages. WebdriverIO teams typically start with JavaScript or TypeScript.