Test emails without the risk
The developer-first SMTP sandbox that captures, previews, and manages your emails in a beautiful web interface. Never accidentally send to real users again.
Email Sandbox
3 new emails today
Welcome Email
Newuser@example.com • 2 minutes ago
Newsletter Update
newsletter@company.com • 1 hour ago
Account Verification
noreply@app.com • 3 hours ago
Everything you need to test emails
From SMTP testing to spam analysis, get all the tools your team needs to build and test email functionality with confidence.
Test SMTP sending in seconds
Connect your application to our SMTP server and start testing email delivery instantly. No configuration hassle, no risk of sending emails to real users. Just point your app to our server and test with confidence.
Dedicated inbox for each sandbox
Every sandbox gets its own dedicated email address that can receive emails from anywhere. Perfect for testing webhooks, email notifications, registration flows, or any integration that sends emails. All incoming emails are instantly captured and ready to inspect.
Test emails directly in your code
Integrate email testing into your automated test suites with our SDK. Write tests that create email addresses, send emails via SMTP, and verify delivery - all in a few lines of code. Perfect for CI/CD pipelines and integration tests.
import { MailloopClient } from '@mailloop/sdk';
const client = new MailloopClient('your-api-key');
const email = await client.createEmail('sandbox-id');
// Send via SMTP
await sendEmail(email.address);
// Wait for received email
const received = await client.waitForEmail(email.id, {
timeout: 5000
});
expect(received.subject).toBe('Welcome!');Analyze deliverability & spam score
Get instant feedback on your emails before sending them to real users. Our analysis engine checks spam scores, validates authentication (SPF, DKIM, DMARC), verifies blacklist status, and analyzes content for potential issues. Ensure maximum deliverability from the start.