Mailosaur
Email testing software
Software testing tools
Automation testing tools
DevOps software
- Features
- Ease of use
- Ease of management
- Quality of support
- Affordability
- Market presence
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$9 per month
Free Trial
Free version unavailable
Small
Medium
Large
- Information technology and software
- Transportation and logistics
- Energy and utilities
What is Mailosaur
Mailosaur is an email testing platform that captures and inspects emails sent by applications so teams can validate email content, links, attachments, and delivery behavior in automated tests. It is used by QA, engineering, and DevOps teams to test transactional and marketing-related email flows across environments without relying on real inboxes. The product provides dedicated test email addresses/servers, an API, and integrations for common test frameworks and CI pipelines. It also supports validating SMS messages as part of end-to-end messaging tests.
Purpose-built test inboxes
Mailosaur provides dedicated servers and addresses designed specifically for automated testing rather than human mailbox use. This reduces reliance on consumer inbox providers and avoids polluting real mailboxes during test runs. Teams can programmatically search, filter, and retrieve messages to assert on subject lines, HTML/text bodies, headers, links, and attachments.
Automation and CI friendly APIs
Mailosaur offers APIs and client libraries that fit common automated testing workflows. Tests can wait for messages, fetch the latest email for an address, and perform deterministic assertions as part of CI. This aligns well with DevOps practices where email validation is part of regression suites and release gates.
Content and security validations
Mailosaur supports validations that go beyond simple receipt checks, such as link extraction, attachment handling, and verification of codes/OTP-style content. It can help teams detect template regressions and broken links earlier than manual review. These capabilities are useful when compared with general email marketing tools that focus on sending rather than test automation.
Not an email delivery platform
Mailosaur focuses on capturing and testing messages, not on running production email campaigns or managing subscriber lists. Organizations still need a separate email service provider for sending at scale and handling deliverability operations. This can add integration work when teams expect an all-in-one email solution.
Requires test design discipline
Effective use depends on well-structured test data, stable selectors/assertions, and careful handling of asynchronous email delivery timing. Poorly designed tests can become flaky if they rely on broad inbox searches or insufficient waiting strategies. Teams may need to invest time in building reliable patterns for message matching and cleanup.
Scope limited to messaging tests
Mailosaur addresses email (and SMS) verification, but it does not replace broader functional testing suites, performance testing, or full observability tooling. For end-to-end quality programs, it typically complements other test automation and DevOps tools. Buyers looking for a general-purpose testing platform may find the scope narrow.
Plan & Pricing
| Plan | Price | Key features & notes |
|---|---|---|
| Starter | $9 per month (billed annually) | Includes 50 daily email tests (upgradable to 1,000 daily tests), unlimited email addresses, API for test automation, SMTP connectivity, increase users/emails at any time. Add extra users for $9/month. Try free for 14 days. |
| Business | $80 per month (billed annually) | Includes 5,000 daily email tests, plus 500 SMS messages/month. Up to 5 users included; additional users from $16/month. Email previews add-on available from $16/month. Extra emails from < $1/month; extra SMS from $20/month. Includes SMS testing, automated forwarding/filtering, reply-to messages, Mailosaur Authenticator for MFA. Try free for 14 days. |
| Enterprise | Custom | Custom pricing and limits; contact sales. Pricing calculator available on site. |
