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Mailosaur
What Mailosaur is
Mailosaur captures email and SMS messages for testing in a web dashboard and through an API. Teams can run end-to-end checks on sign-ups, authentication, password resets, one-time passcodes and multi-factor authentication. Its previews show email rendering across clients and devices, including light and dark modes, using real devices. Inspect message content, layout, links and flows, then check accessibility and email-client compatibility. Integrations and guides cover Cypress, Playwright, Selenium, Cucumber, Robot Framework, Postman, Insomnia, WebdriverIO, TestCafe, PowerShell and Ghost Inspector. Official API clients are listed for Node.js, Java, Ruby, Python, .NET, PHP, Go and JavaScript. Plans include Personal at $20 a month billed annually, Core at $50 a month billed annually, and custom-priced Enterprise. Personal has one inbox; inbox counts depend on the plan. There is no free plan, but a 14-day trial is available. Mailosaur lists Google Cloud hosting in EU and UK data centers, AES-256 encryption at rest, and ISO 27001:2022 and PCI DSS compliance.
Who it suits
Mailosaur suits teams testing email and SMS workflows, accessibility, links and client compatibility through web or API tools. It also fits organizations needing listed integrations, API libraries, enterprise identity options or controlled inboxes.
What it does well
- Tests email and SMS workflows end to end
- Previews rendering on real devices
- Checks accessibility, links and email-client compatibility
- Official clients cover eight listed languages
- 14-day trial available
What to know first
- No free plan
- Personal plan includes one inbox
- External sending requires recipient consent verification
- Enterprise pricing is custom
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Personal | annually · 1 user (supports up to 3) · 1 inbox · unlimited email addresses · from 15,000 inbound emails/month (daily limit 500) · email compatibility testing · test automation API | $20 a month |
| Core | annually · 5 seats included · multiple inboxes · unlimited email addresses per inbox · from 75,000 inbound emails/month (daily limit 2,500) · accessibility testing · mail rules and auto-forwarding · POP3 and IMAP · SMS and authentication from $37.50/month · email previews from $25/month | $50 a month |
| Enterprise | custom · Custom users and inboxes · team/project permissions · SSO with SAML2 and OIDC · SCIM and custom session timeouts · advanced support and SLAs · account manager · custom terms · phone numbers from all available countries | On request |
As mailosaur.com lists them, read 30 Sept 2026. The maker's own page has the final word.
Verdict
Mailosaur combines message capture, workflow testing, previews and API access for email and SMS quality checks. Its plan structure and inbox limits should be reviewed before choosing a tier.
Facts from Mailosaur's own pages
- API libraries
- Official API clients are listed for Node.js, Java, Ruby, Python, .NET, PHP, Go, and JavaScript. · mailosaur.com, 30 Sept 2026
- Cloud hosting
- Mailosaur says its servers are hosted on Google Cloud Platform in data centers in the EU and United Kingdom. · mailosaur.com, 30 Sept 2026
- Compliance
- Mailosaur states that it is ISO 27001:2022 certified and PCI DSS compliant, and adheres to GDPR, the Data Protection Act, and CCPA. · mailosaur.com, 30 Sept 2026
- Email and SMS tests
- The service supports end-to-end tests of email and SMS workflows such as sign-ups, authentication, password resets, OTPs, and MFA. · mailosaur.com, 30 Sept 2026
- Email previews
- Email previews show rendering across clients, devices, and light and dark modes using real devices. · mailosaur.com, 30 Sept 2026
- Encryption
- Mailosaur says its systems use current encryption protocols and cipher suites, with AES-256 encryption at rest. · mailosaur.com, 30 Sept 2026
- Enterprise identity
- Enterprise SSO supports SAML and OpenID Connect, and Mailosaur documentation names Okta, Microsoft Entra ID, and Ping Identity as example identity providers. · mailosaur.com, 30 Sept 2026
- External email sending
- To send, reply to, or forward email to an external address, Mailosaur requires verification that the address owner has given consent. · mailosaur.com, 30 Sept 2026
- Headquarters
- The Square, Basing View, Basingstoke, Hampshire RG21 4EB, United Kingdom · mailosaur.com, 28 Sept 2026
- Inbox limits
- The number of inboxes depends on the plan, and Personal plan customers cannot create additional inboxes. · mailosaur.com, 30 Sept 2026
- Integrations
- Mailosaur lists integrations and guides for frameworks and tools including Cypress, Playwright, Selenium, Cucumber, Robot Framework, Postman, Insomnia, WebdriverIO, TestCafe, PowerShell, and Ghost Inspector. · mailosaur.com, 30 Sept 2026
- Message checks
- Teams can inspect message content, layout, links, and flows, and validate accessibility and email-client compatibility. · mailosaur.com, 30 Sept 2026
- Product
- Mailosaur captures email and SMS messages and lets teams test them through its web dashboard and testing API. · mailosaur.com, 30 Sept 2026
- Support
- The Enterprise plan includes advanced support and SLAs, an account manager, and support for custom terms. · mailosaur.com, 30 Sept 2026
Where Mailosaur stands on Freedom251
- Email Testing Software#23 of 28