MailSlurp provides programmable email addresses and phone numbers with APIs, SDKs and dashboards for testing and automating email and SMS workflows.
- for
- Developers and QA engineers building, testing or automating email and SMS flows.
- pricing
- freemium · free trial
Key features
- Programmable inboxes — Create unlimited temporary or permanent email inboxes, use custom domains or connect Gmail/Outlook via API, SMTP, IMAP and webhooks.
- Programmable phone numbers — Provision real mobile numbers for SMS, OTP and MFA, receive texts and route them into applications.
- Device rendering & inbox placement — Preview emails on real clients and devices, audit links and images, and test inbox or spam placement.
- AI data extraction — Convert emails, PDFs and attachments into structured JSON using prompts, schemas and OCR.
- Shared dashboards & enterprise access — Manage inboxes, numbers and results with roles, SSO, SCIM, audit logs and team permissions.
- Load & scale testing — Use inbox pools with k6, JMeter or Locust to verify message delivery under load.
- Webhooks & automation — Trigger webhooks, forwarding, automatic replies and integrate with Zapier, MCP and other automation tools.
- SDKs & REST API — Official SDKs for JavaScript, TypeScript, Python, Java, C#, PHP and direct REST API access.
Use cases
- End-to-end testing of signup, password-reset and notification flows with real email and SMS.
- Automated campaign checks: device rendering, email audit and inbox placement before sending.
- Extracting order or invoice data from incoming emails and attachments for downstream processing.
- Running load tests that verify email/SMS delivery timing and content at scale.
MailSlurp pricing
- FreeFree500 emails received / month · 1,000 sandbox sends / month · 1 device render / month · 1 inbox placement test / month
- StarterFree1,000 emails received / month · 100 test sends / month · 5 device renders / month · 3 inbox placement tests / month
MailSlurp vs alternatives
| Best for | Programmable email & SMS testing | Event gateway for webhook handling | API testing and debugging | Automated deployments | Log aggregation and monitoring |
|---|---|---|---|---|---|
| Pricing | Freemium | Free | Free | Free | Subscription |
| DevHunt upvotes | 3 | 30 | 48 | 32 | 39 |
| Launched | Sep 2024 | Mar 2024 | Jan 2023 | Jun 2024 | Apr 2026 |
- MailSlurp vs Hookdeck: Hookdeck focuses on event routing, while MailSlurp provides full email/SMS inbox and testing capabilities.
- MailSlurp vs Firecamp: Firecamp is an API client similar to Postman, whereas MailSlurp is a programmable email/SMS testing platform.
- MailSlurp vs DeployHQ: DeployHQ automates deployments; MailSlurp automates email/SMS testing and data extraction.
- MailSlurp vs OpenObserve: OpenObserve provides observability logs; MailSlurp handles email/SMS generation and verification for tests.
MailSlurp FAQ
Which plan should I choose?+
Free is for exploring email workflows and testing; Starter adds higher limits for regular app and campaign tests; Pro adds external sending, premium device previews and business mailbox testing; Growth adds even more capacity for teams.
What happens after I exceed the included allowances?+
Pro and Growth continue with pay-as-you-go rates for extra device renders, inbox placement tests and AI token usage; other limits such as storage or inbox creations are billed per usage.
How does AI extraction usage work?+
Each plan includes a monthly allowance of weighted AI tokens; usage beyond that is billed at $1.00 per 10,000 weighted tokens.
Are phone numbers and SMS included in the plans?+
Phone number rentals and SMS/MMS messaging are charged separately per country and usage; they are not included in the plan allowances.
What enterprise features are available?+
Enterprise offers custom capacity, isolated environments, regional hosting, SAML/OIDC SSO, SCIM, audit logs, SOC 2 compliance, custom onboarding and Slack or Microsoft Teams support.
Summarized by DevHunt from mailslurp.com · Sep 28, 2026. Details may change; check the official site.