Build software that works, first time

Create and test products that are high quality from the very start.

An SMS message being processed by Mailosaur

Join thousands of engineering teams that are creating amazing software with the help of Mailosaur


Focus on building features and functionality, not testing infrastructure

Mailosaur lets engineering teams get on with development, rather than maintaining custom testing tools

Developer Sandboxes

Give everyone on your team their own email server for development. Allow developers to send, capture and analyse emails during development, with their own personal email and SMS sandbox.

Test email and SMS in one place

Use the same code to capture and test SMS messages, with a single platform that handles all communication testing consistently.

Environment Segregatation

Shield your development and staging environments, by configuring them to send everything to Mailosaur rather than messaging a customer by mistake.

Emails being routed through Mailosaur in development and staging, and directly to customers in production

Unlimited email addresses

Use any email address you want, with no code required

Use a unique email address for every test, build, team member, environment or any other use case you have. With Mailosaur supporting an unlimited number of email addresses that you can send to from anywhere.

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Mailosaur is extremely reliable and offers ease of implementation. The support is thorough, responsive and very personable.


How it works

Boost end-to-end test coverage in minutes, by integrating with Mailosaur.

Send an email or SMS message

Trigger a process in your product that sends out email or SMS (e.g. requesting a password reset).

Fetch the email from Mailosaur

Use one of our client libraries to pinpoint and pull the email down into your test code.

Complete the process

Whether it’s checking the content of the message, following a link or using a verification code. Complete the end-to-end process you’re testing.

Why Mailosaur?

Automate with your favourite framework

Write tests with the tools and frameworks you’re already familiar with. With support for all the world’s major testing frameworks, including Cypress, Playwright, Selenium and Robot Framework, and more.

Manage team access centrally, per project

Work in harmony with other teams and departments globally with our centralised system which allows shared access for your entire team on a single account.

Compliant & secure

With comprehensive Information Security and GDPR-compliant controls, we are committed to protecting your data.

The Mailosaur Dashboard displaying an email with errors and warnings detected

Ready to get started?

Get in touch or create an account.