MailSlurp
MailSlurp: A developer-focused testing suite spanning inboxes, rendering, audits, placement, and automation. Ranked #5 of 27 in Email Testing Software by our editors (8.0/10); pricing: Free plan; best for end-to-end email and SMS testing.
At a glance
- Editor score8.0 / 10
- PricingFree plan
- Best forEnd-to-end email and SMS testing
- Free planYes
- Paid from$19.99/mo
- Email clients2 clients
- Facts checked20 Sep 2026
Where it wins
- Programmable inboxes support end-to-end email and SMS workflow testing.
- Audits cover links, images, accessibility, and HTML/CSS.
- API, SDK, SMTP, IMAP, webhooks, and test-runner integrations are available.
Where it doesn't
- Verified email previews cover two email clients.
- Free and Starter plans have limited device renders and placement tests.
- Enterprise capacity and pricing are custom rather than listed monthly tiers.
Our verdict on MailSlurp
MailSlurp is a hosted email and SMS testing platform for developers, QA teams, email marketers, and deliverability teams. Its core toolkit combines programmable permanent and disposable inboxes with workflow testing, rendering previews, email quality audits, inbox placement checks, and message automation. Teams can inspect messages, attachments, links, HTML, accessibility findings, and delivery outcomes through web and API access. Connected Gmail or Outlook mailboxes, custom domains, phone numbers, SMTP, IMAP, and webhooks extend the testing surface beyond basic inbox simulation.
The published plans show a freemium structure with monthly pricing. Free includes 500 emails received, 1,000 sandbox sends, 1 device render, 1 inbox placement test, 3 email quality audits, and 100 inbox creations per month. Starter costs $19.99 per month and adds 1,000 received emails, 100 test sends, 5 device renders, 3 placement tests, 10 audits, and Zapier. Pro costs $49.99 per month with 5,000 received emails, 500 external sends, 10 device renders, 10 placement tests, premium device targets, and business mailboxes. Growth costs $129.99 per month and raises rendering and placement allowances to 200 and 100, while adding 2 users and 1 custom domain. Enterprise provides custom capacity, SAML and OIDC single sign-on, SCIM provisioning, regional hosting, SOC 2 compliance, and custom onboarding and support.
MailSlurp fits teams that want programmable testing inside development and QA workflows. Language support includes C#, .NET, Go, Java, JavaScript, PHP, Python, Ruby, and TypeScript, while Cypress, Playwright, Selenium, and BrowserStack support test automation. Integrations include Braze, Brevo, and Zapier on Starter. The product also covers inbox, spam, promotions, and junk placement, plus accessibility and link checks. Teams needing verified previews beyond two email clients, or a narrower low-volume tool, should compare alternatives before choosing MailSlurp.
Your product? Our editors can test MailSlurp in depth and publish a review, labelled as paid · from $149/mo →
MailSlurp pricing
All 5 MailSlurp plans and prices →
MailSlurp fact sheet
| Free plan | Yes |
|---|---|
| Paid from | $19.99/mo |
| Email clients | 2 clients |
| Device coverage | Both |
| Spam checks | Yes |
| Accessibility checks | Yes |
| Link checks | Yes |
| Inbox testing | Yes |
| API access | Yes |
| Deployment | Cloud |
| Platforms | Web |
| Compliance & security | SOC 2, GDPR |
| Support | Tickets, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 79+ integrations: C#, .NET, Go, Java, JavaScript, PHP … See all → |
| Pricing | Free plan (source) |
| Website | mailslurp.com |
| Facts checked | 20 Sep 2026 |
MailSlurp integrations
MailSlurp lists 79+ integrations on its own site — the 20 named here are the ones its pages call out.
- C#
- .NET
- Go
- Java
- JavaScript
- PHP
- Python
- Ruby
- TypeScript
- Cypress
- Playwright
- Selenium
- BrowserStack
- Braze
- Brevo
- Constant Contact
- GetResponse
- HubSpot
- Klaviyo
- Mailchimp
See all MailSlurp integrations →
Alternatives to MailSlurp
- LitmusBroad pre-send email QA with previews, testing, monitoring, integrations, and APIs.9.3
- Twilio Email TestingA flexible email-testing option with a free trial, rendering checks, spam tests, and API access.8.8
- GlockAppsA broad deliverability toolkit for inbox placement, reputation, authentication, and alerts.8.5
See all MailSlurp alternatives →
MailSlurp vs the competition
- MailSlurp vs Litmus
- MailSlurp vs Twilio Email Testing
- MailSlurp vs GlockApps
- MailSlurp vs Mailtrap Email Sandbox
- MailSlurp vs Mailinator
- MailSlurp vs Mailosaur
Compare MailSlurp with any tool side by side →
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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used MailSlurp for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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