What's new Webhooks are now live

Email testing for any environment

Mailloop is an SMTP sandbox that captures, previews, and helps you test email functionality. In code, tests or any external sources.

Start Free Sandbox S View documentation D
No credit card needed
EU-hosted
GDPR compliant
SMTP Sandbox

Send test emails via standard SMTP

Point your application to our SMTP server and start testing immediately. Works with any language or framework. All emails are captured and displayed in your sandbox inbox with full HTML preview, headers, and attachments.

SMTP Configuration
Host sandbox.mailloop.io
Port 587
Username sandbox_abc123def456
Password ••••••••••••••••
TLS/SSL encryption supported
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.

npm install @mailloop/sdk
registration.test.ts
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 the verification email
const email = await mailloop.emails.waitFor(
sandbox.id, { subject: 'Verify your email' }
);
// Assert on content
expect(email.html).toContain('activation link');
Email Receiving

Receive emails from anywhere

Every sandbox gets a dedicated email address. Test webhooks, third-party integrations, or any scenario where emails come from outside your app.

Deliverability Analysis

Check spam scores before going live

Instant feedback on spam scores, SPF/DKIM/DMARC validation, blacklist status, and content analysis. Know your emails will land in the inbox.

GDPR Compliant

Privacy-first, EU-hosted infrastructure

All data is processed and stored on EU servers. Full data export, account deletion on request, and no third-party tracking. Your test data stays yours.

Compatibility

Works out of the box with

Whole team uses it daily, no one's complained once. It does what we need. Honestly, what more do you want from a tool like this?
Vít Kašpar
Vít Kašpar
CFO & Product Owner at Livebid

Start testing emails today

Exhaustive SMTP sandbox, ready SDKs, and a full-featured inbox to help you test every email your app sends. GDPR compliant and EU-hosted.

Start for free View documentation