Communication testing for Product Managers
Deliver high-quality user experiences, every time
All-in-one testing and demo tool for product management teams.
Proven capabilities, trusted by thousands
Seamlessly collaborate across teams
Preview emails
See what your emails really look like, on everything from Microsoft Outlook and IBM Notes on PC, to Apple Mail on iPhone and Gmail on Android.
Bring teams together
Work in harmony with other teams and departments globally with Mailosaur’s centralized system, allowing shared access for 500+ users on a single account.
Replicate real users
Simulate the user journey easily and accurately with access to unlimited email addresses and dedicated mobile phone numbers.
Reduce risk and last minute delays
Message‑driven issues are a common cause of post-release issues.
From one-time passcode messages that don't behave properly, to customers hitting reply (when your previous testing hadn't covered that,) Mailosaur can ensure issues are caught before deployment, so your brand trust isn't impacted.
Validate the experience, not just the message
Mailosaur empowers Product Managers to see exactly how emails and SMS behave in real journeys; trigger to delivery to interaction.
Instead of reviewing screenshots or relying on assumptions, you can validate that the right message is sent at the right moment, the content and rendering are correct across inboxes and, crucially, that the journey still makes sense when users reply or interact.
Used by those in the know
This is the easiest solution to test your emails and I can show you how it works in 5 minutes.
Bring stakeholders into the review process
Mailosaur makes it easy to share messages and previews with stakeholders for review, without forwarding real emails or using personal inboxes.
Product Managers can gather async feedback from design, marketing, engineering, or compliance, and keep discussions focused on a single source of truth, while moving decisions forward faster.
Fewer customer‑reported issues after launch
By validating communications before release, teams reduce the risk of releasing confusing or broken onboarding journeys, preventing surges in support tickets and eroded trust.
Broken authentication flows can be enough for some customers to reconsider your competitors, especially when being unable to access their account prevents them accessing money, using a product they've paid for, or checking on a purchase they've made.
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.
Test all user interactions
Test end-to-end scenarios, validate emails, and integrate with our API for seamless workflows.
Start your 14 day free trial today.