Product Announcement Developer Tools
Mailloop API and JavaScript SDK Now Available
We've released a public API and JavaScript SDK for Mailloop. Create sandboxes, fetch emails, and automate email testing directly from your code.
Honza Charamza
Test emails without
hitting real inboxes
Mailloop is an SMTP sandbox that captures, previews, and helps you test email functionality. In code, tests or any external sources.
Incoming emails
Retrieved data
SMTP Testing
Send test emails via standard SMTP
Point your application to our SMTP server and start testing immediately. Works with any language or framework that supports SMTP. All emails are captured and displayed in your sandbox inbox.
SMTP Configuration
sandbox.mailloop.io
587
sandbox_abc123def456
••••••••••••••••••••
TLS/SSL encryption supported
import MailloopClient from '@mailloop/sdk';
const mailloop = new MailloopClient({ apiKey });
// Create isolated test inbox
const sandbox = await mailloop.sandboxes.createTemporary(
{ name: 'Registration Test' }
);
// Trigger registration in your app
await app.registerUser(sandbox.emailAddress);
// Wait for verification email
const email = await mailloop.emails.waitFor(
sandbox.id,
{ subject: 'Verify your email' }
);
// Assert on content
expect(email.html).toContain('activation link');
JavaScript SDK
Test emails programmatically
Use our TypeScript SDK to integrate email testing directly into your test suites. Create temporary inboxes, wait for specific emails, and assert on content. Perfect for CI/CD pipelines.
Temporary sandboxes
Create isolated inboxes for each test run, auto-cleanup after expiry
Smart waiting
Wait for emails matching subject, from, or custom filters with configurable timeout
Full TypeScript support
Complete type definitions with zero dependencies
npm install @mailloop/sdk
Email Receiving
Receive emails from anywhere
Every sandbox gets a dedicated email address that can receive emails from external sources. Test webhooks, third-party integrations, or any scenario where emails come from outside your app.
Your Sandbox Address
sandbox-abc123@sandbox.mailloop.io
147
Emails Received
Active
Status
95 out of 100
Excellent Deliverability
This email is ready to send
Deliverability Analysis
Check spam scores before going live
Get instant feedback on your emails. Our analysis engine checks spam scores, validates authentication (SPF, DKIM, DMARC), verifies blacklist status, and analyzes content for potential issues.
Built for real development
Whether you're building a new feature, running automated tests, or debugging production issues.
Instant inbox creation
Spin up isolated inboxes for each test run. Perfect for CI/CD pipelines and parallel testing.
Real-time capture
Emails appear instantly in your inbox. No polling, no delays, just immediate visibility.
Developer SDK
TypeScript-first SDK with full type safety. Wait for emails and assert on content programmatically.
Spam analysis
Check spam scores and deliverability before going to production. Catch issues early.
REST API
Full-featured REST API for custom integrations. Webhook support for real-time notifications.
Team collaboration
Share inboxes with your team. Role-based access control keeps everything organized.
From the blog
Learn more about email testing and Mailloop.
Ready to test your emails?
Create your first sandbox in seconds. No credit card required. Generous free tier for one person business.