Test everything that relies on email
Securely test every email‑driven workflow, from sign‑ups to alerts, across realistic environments before customers rely on them.
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
Stop relying on personal inboxes and fragile workarounds. Create unlimited test addresses to simulate real users, edge cases, and journeys, without polluting real systems or inboxes.
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
From broken layouts to missing data or failed verification emails, Mailosaur helps teams prevent issues that directly impact conversion, trust, and security.
Whether you’re building, testing, or approving customer journeys, you can verify and preview emails in realistic conditions without relying on guesswork.
Automate processes you never thought you could
When email flows are automated, testing needs to be just as reliable.
Use Mailosaur’s API to automate end‑to‑end testing for email‑driven journeys, from OTP extraction to cancellation and recovery flows, as part of your CI/CD pipeline.
What do our customers think?
See reviews and case studies from companies who trust us with their email monitoring/ QA needs.
5.0
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.
5.0
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.
5.0
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.
Don’t just assume consistency
Cover all bases and generate previews of your emails across countless devices, email clients, and even light and dark modes to ensure all of your customers are getting the exact message you're aiming to send.
It doesn't end when you hit send
Email is rarely the end of a journey, it’s often the trigger for a longer flow.
Test what happens when users interact with emails, including replies, forwards, incorrect OTP entry, and unexpected paths.
Why stop there?
Mailosaur covers every message‑driven journey. Built for robust and comprehensive quality assurance, 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.
Used across teams and industries
QA teams ensure reliability. Product teams protect journeys. Marketing teams avoid brand‑damaging mistakes.
If your product sends emails, they’re part of the experience, and they need to be tested.
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
New to Mailosaur?
Get started with us for free
Book your free personalised demo, or start your 14-day free trial.