Test everything that relies on email
Test emails safely in production/ staging environments, validate notifications, and automate QA checks across real devices and conditions.
Join thousands of businesses who rely on Mailosaur
Go beyond basic email testing
Don't settle for being "pretty sure" your emails are hitting the mark.
Unlimited test accounts
Ditch personal email accounts and messy workarounds. Create as many test addresses as you need to test different users, journeys, and edge cases.
Capture every email
Catch every email your product sends; whether emails arrive and render correctly, and even automatically extract and test links and dynamic content.
Mimic real scenarios
Mailosaur allows you the freedom to replicate real world scenarios including deliverability validation, and validating tokens and OTPs (one-time passcodes).
Eliminate mistakes before customers see them
Mailosaur’s email testing platform ensures every message is error-free and pixel-perfect, with no broken layouts, typos, or missing details.
Whether you’re a developer, QA engineer, or marketing team, you can verify and preview messages in realistic environments - ensuring your product and campaigns look perfect in every inbox.
Automate processes you never thought you could
With Mailosaur's email and SMS testing API, you can automate end-to-end testing, from extracting and testing OTP codes to ensuring cancellation flows are triggered as intended.
What do our customers think?
See reviews and case studies from companies who trust us with their email monitoring/ QA needs.
"A lot of our automation that deals with email relies on [Mailosaur]. The setup for validating links inside of the emails was very easy to work with in the Mailosar API."
"Excellent customer support, they are very knowledgeable about their tool, every time I have ended conversations with Mailosaur support I have ended it with the solution to my problem."
"Our automated testing is a breeze with Mailosaur and I use for manual QA as well. The emails show up incredibly fast and it seamlessly integrates with Cypress. I recommend them unreservedly."
It doesn't end when you hit send
Customers don't just read your emails, they interact with them, which leaves you with countless user journeys to prepare for.
With Mailosaur you don't just check the email itself works, but have scope to see exactly what happens if customers reply or forward your emails, put in an OTP wrong (negative testing), and limitless possibilities besides.
Why stop there?
Mailosaur does loads more than email previews! Built for robust and comprehensive QA testing, you can test all sorts of flows end to end.
Email previews
See exactly how your emails will render across devices, email clients, and settings (e.g. light and dark mode), and ensure every customer gets five-star communication.
SMS testing
Ensure your time-sensitive SMS are dispatched and delivered exactly when your customers need them, with the added benefit of dedicated test numbers.
Made to fit into your existing stack
Mailosaur meets you where you are, integrating with frameworks you know and love, and unlocking new levels of QA for your messages.
Frequently asked questions
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Get started with us for free
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