Email & SMS testing for enterprise
When operating at scale, email and SMS testing can fragment across tools and environments. Mailosaur brings control and consistency to customer communications.
Modernizing enterprises around the world
One platform, one source of truth
Mailosaur provides a centralised platform for email and SMS testing, giving enterprises a shared standard for how customer‑facing messages are validated, previewed, and approved, across teams, departments, and regions.
This replaces fragmented tooling with a single, governed system your organisation can trust.
Protect your brand, not just your releases
Broken layouts, incorrect content, or expired codes are immediately visible to customers.
Mailosaur helps prevent these failures, isolating test environments from real customers, validating messages before they reach production and supporting approval and review workflows for high‑risk communications.
Built for governance at scale
Mailosaur standardises how communication is tested without blocking delivery, with:
Shared environments for email and SMS testing
Role‑based access and team permissions
Consistent tooling across products and departments
Audit-ability for how critical messages are validated
Loved by enterprises everywhere
5.0
Awesome, easy to use email tool with REST capabilities. After hand-rolling a Python script and trying various email providers and APIs, Mailosaur was a breath of fresh air. It had a simple interface and was easy to implement, first in Postman and then in Cypress.
Your business is safe with the world's leading email testing platform
Automate end-to-end scenarios, validate emails, and integrate with our API for seamless workflows.
Start your 14 day free trial today.
Secure by design
Mailosaur is built with enterprise security and data protection at its core. The platform is ISO 27001:2022 certified, GDPR compliant, and designed with strict controls around access, data handling, and retention.
From configurable message retention policies to carefully managed permissions, every aspect of Mailosaur is designed to support secure, compliant testing at scale.
Work the way you like
Integrate with any CI platform
Seamlessly integrate email and SMS testing into any build pipeline, including support for GitHub Actions, Jenkins, TeamCity and more.
Work with your favorite framework
Write tests with tools and frameworks. Mailosaur supports testing frameworks like, Cypress, Playwright, Selenium, Robot Framework, and more.
Create tests in any language
Mailosaur's straightforward client libraries provide support for major languages, including Node.js, Java, Python, .NET, Ruby, PHP and Go.
Previews as part of a controlled pipeline
Mailosaur allows preview generation to be integrated into automated pipelines, ensuring emails are rendered accurately across real devices, inboxes, and display modes before campaigns or releases are approved.
This creates consistency across regions, brands, and products without relying on manual checks or screenshots.
Our products
Everything you need to test customer communication
Email testing
Create end-to-end tests that rely on email. Test account verification emails, password resets, email tracking, and more
Email previews
Instantly see how your email will look to any recipient, no matter what email client they use, so there are no nasty surprises.
SMS testing
Build text messages that work. Create end-to-end tests that cover identity verification, alerting, promotional messages, and more
Frequently asked questions
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