Mailosaur
Mailosaur captures email and SMS messages so teams can test communication workflows through a web dashboard and testing API.
What Mailosaur is
Mailosaur captures email and SMS messages so teams can test communication workflows through a web dashboard and testing API. It supports end-to-end checks for scenarios including sign-ups, authentication, password resets, one-time passcodes, and multi-factor authentication. Email previews show how messages render across clients and devices, in light and dark modes, using real devices. Teams can inspect message content, layout, links, and flows, and check accessibility and email-client compatibility. Integrations and guides cover tools such as Cypress, Playwright, Selenium, Postman, and WebdriverIO, while official API clients are listed for Node.js, Java, Ruby, Python, .NET, PHP, Go, and JavaScript. The Personal plan is $20 a month billed annually and includes one inbox; Personal customers cannot create additional inboxes. Enterprise pricing is custom. The service has no free plan and offers a 14-day trial.
Good
- Tests email and SMS end-to-end workflows.
- Previews email across clients, devices, and modes.
- Checks accessibility and email-client compatibility.
- Official API clients span eight listed languages.
Watch out
- No free plan; trial lasts 14 days.
- Personal plan is limited to one inbox.
- Personal costs $20 a month billed annually.
Who it suits
Mailosaur suits teams automating email and SMS workflows or checking email rendering, links, accessibility, and compatibility. The plan differences matter if a team needs multiple inboxes or Enterprise identity and support features.
Verdict
Mailosaur combines workflow testing with email previews and message checks. Review inbox limits and plan pricing, especially if multiple inboxes or SMS testing are needed.
Plans and prices
From Mailosaur's own pricing page, checked 30 Sep 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Personal | $20 a month | 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 · annually |
| Core | $50 a month | 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 · annually |
| Enterprise | Priced on request | 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 · custom |
The facts
Each one read from Mailosaur's own pages, with the date it was checked.
What it does
- API libraries
- Official API clients are listed for Node.js, Java, Ruby, Python, .NET, PHP, Go, and JavaScript.checked 30 Sep 2026
- Cloud hosting
- Mailosaur says its servers are hosted on Google Cloud Platform in data centers in the EU and United Kingdom.checked 30 Sep 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.checked 30 Sep 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.checked 30 Sep 2026
- Email previews
- Email previews show rendering across clients, devices, and light and dark modes using real devices.checked 30 Sep 2026
- Encryption
- Mailosaur says its systems use current encryption protocols and cipher suites, with AES-256 encryption at rest.checked 30 Sep 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.checked 30 Sep 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.checked 30 Sep 2026
- Inbox limits
- The number of inboxes depends on the plan, and Personal plan customers cannot create additional inboxes.checked 30 Sep 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.checked 30 Sep 2026
- Message checks
- Teams can inspect message content, layout, links, and flows, and validate accessibility and email-client compatibility.checked 30 Sep 2026
- Product
- Mailosaur captures email and SMS messages and lets teams test them through its web dashboard and testing API.checked 30 Sep 2026
- Support
- The Enterprise plan includes advanced support and SLAs, an account manager, and support for custom terms.checked 30 Sep 2026
The company
- Headquarters
- The Square, Basing View, Basingstoke, Hampshire RG21 4EB, United Kingdomchecked 28 Sep 2026
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