Supercharged testing, monitoring, and compliance for every customer touchpoint
Run end‑to‑end email and SMS testing, and generate real‑device email previews. Validate sign‑ups, password resets, and authentication flows with secure team inboxes, dedicated phone numbers and accurate previews all in one connected workflow.
npm create mailosaur@latest
Email quality
Verify every message before it hits an inbox - check content, layout, links, and flows end-to-end.
SMS testing
Test OTPs, MFA codes, and transactional messages with dedicated numbers and secure delivery.
Email previews
See how your emails render across clients, devices and dark mode, with previews integrated into your email tests.
Built for your team
Mailosaur gives your team a dedicated, scalable environment for stress-free message testing and email previews your whole team can rely on.
No more dummy accounts or cluttered inboxes - create test addresses instantly, connect your CI/CD pipeline, and automate everything with flexible APIs and native integrations for Cypress, Selenium, and Playwright.
Book a demo to see how Mailosaur keeps your tests clean, fast, and reliable.
Works with any testing framework
Mailosaur works with the tools you already use. It's quick and easy to add powerful features to your test setup.
Preview every message before you hit send
Check how emails appear across email clients, devices, and even light and dark modes before they reach real inboxes.
Spot layout bugs, broken links, missing content, and formatting problems before they affect users.
Generate, review and share email previews from the same dashboard your team uses for email and SMS testing - no extra tools required.
Real devices are used to generate previews, not inaccurate emulations, leaving you with authentic results that reflect real user experience.
Customer stories
“If we couldn’t use Mailosaur anymore, it’d be a serious disruption. I’d only hope the replacement looks and works half as well.”
See Mailosaur in action
Book a free, personalised demo
Book your demo with one of our experts, and see how Mailosaur works, the ease of integration, and discuss how it could fit into your flows.
Start your free trial
With your 14-day free trial, explore the Mailosaur dashboard for yourself and see how easy it is to test and preview your crucial messages.
Get in touch
Our dedicated team is on hand to answer your questions, so feel free to get in touch at any time with any comments, queries or concerns.
// Step 1: Send an email into Mailosaur
// Step 2: Fetch your message via Mailosaur
const MailosaurClient = require('mailosaur');
const mailosaur = new MailosaurClient('YOUR_API_KEY');
const criteria = {
sentTo: 'anything@YOUR_SERVER_ID.mailosaur.net',
};
const email = await mailosaur.messages
.get(serverId, criteria);
// Step 3: Complete the process
expect(email.subject).toBe('My password reset');// Step 1: Send an email into Mailosaur
// Step 2: Fetch your message via Mailosaur
const MailosaurClient = require('mailosaur');
const mailosaur = new MailosaurClient('YOUR_API_KEY');
const criteria = {
sentTo: 'anything@YOUR_SERVER_ID.mailosaur.net',
};
const email = await mailosaur.messages
.get(serverId, criteria);
// Step 3: Complete the process
expect(email.subject).toBe('My password reset');Automate tests in minutes
With just a few lines of code added to your project
Integrate Mailosaur with any testing framework - Cypress, Playwright, Selenium, and more. Set it up in minutes with just a few lines of code, no matter your framework or language of choice.
Automate flows you never thought you could, from MFA to password resets, and easily replicate real-world scenarios.
To start, make sure you have a Mailosaur plan. Then, just visit our documentation to get started.
Why choose Mailosaur?
Manual and automated testing
Switch seamlessly between manual and automated testing, as you run end-to-end tests for critical flows. Simple setup, reliable results.
Test secure features
Stop skipping tests for secure areas of your product. Test features that are protected by two-step verification or MFA with Mailosaur.
End-to-end visibility
Inspect every detail of your messages, from subject lines to headers and links, in one intuitive dashboard.
Security standards you can trust
We get it - starting any subscription comes with fresh concerns around security.
Mailosaur is ISO 27001:2022 certified, GDPR compliant, and built with strict data controls - so every test message stays private and protected.
Chosen by QA, Product, and Marketing teams alike
Hear from our customers about how Mailosaur became an integral part of their testing processes.
5.0
Powerful tool for automated testing of emails and SMS. If I were to change company and they didn't have a Mailosaur license I would push to get one.
5.0
We've absolutely loved using Mailosaur. Our automated testing is a breeze with Mailosaur and I use for manual QA as well.
4.5
The UI is really smooth and learning curve is minimal for this software. Even a beginner can get hold of their easy to use process and adapt very quickly.
Frequently asked questions
Test anything your users might do
Automate end-to-end scenarios, validate emails, and integrate with our API for seamless workflows.
Start your 14 day free trial today.