Introduction

Email testing platform for developers and QA engineers. Learn how FounderMail helps you test email functionality in your applications.

What is FounderMail? A modern SaaS platform designed specifically for developers and QA engineers to test applications that require email notifications.

Overview

FounderMail is a comprehensive email testing platform that allows developers and QA engineers to create disposable email addresses, verify email content, and integrate email testing into their automated test suites. Whether you're building web applications, mobile apps, or enterprise software, FounderMail provides the tools you need to ensure your email notifications work perfectly.

Key Features

Instant Email Generation

Generate random email addresses in milliseconds through our API. Each email is isolated, thread-safe, and transactional.

Template Verification

Verify that emails follow specific templates and extract structured data like recipient names, company logos, and more.

SMTP & IMAP Support

Full SMTP server for sending emails and IMAP server for email clients like Thunderbird to download messages.

Email Forwarding

Create forwarders that automatically forward emails to real recipients based on customizable filters.

Webhooks

Get real-time notifications when emails are received with customizable payloads for seamless integration.

Team Collaboration

Create teams and share subscriptions with colleagues for collaborative testing and development.

Integration Testing

FounderMail excels in integration testing scenarios. Here's a typical workflow:

Note: The code below is a conceptual example and not runnable code. For working examples and complete implementation details, see the Developer Guide.

integration-test.ts

// Create a unique, isolated inbox for this test

const inbox = await founderMailApi.createInbox();

// Returns: { smtpKey: "abc123", smtpPassword: "xyz789", email: "abc123@foundermail.mx" }

// Option 1: Configure your app's SMTP to use the dummy server

await myApp.configureSmtp({

  host: "smtp.foundermail.mx",

  port: 587,

  user: inbox.smtpKey,

  password: inbox.smtpPassword

});

// Option 2: Send directly to the inbox email address

await myApp.sendWelcomeEmail(inbox.email);

// Verify the email was received and matches the template

const email = await founderMailApi.getLatestEmail(inbox.smtpKey);

const templateMatch = await founderMailApi.verifyTemplate(

  email.id,

  "user-welcome"

);

// Assert template compliance and extract data

expect(templateMatch.isValid).toBe(true);

expect(templateMatch.extractedData.recipientName).toBe("John Smith");

expect(templateMatch.extractedData.containsLogo).toBe(true);

Why Choose FounderMail?

Affordable Pricing

Cost is a fraction of competitors with even higher limits and generous free tier.

Modern Infrastructure

Built on Kubernetes and hosted on cloud services for fast, reliable responses to integration tests.

Complete Solution

Everything you need for email testing in one platform - no need for multiple tools.

GitHub Repositories

Explore our open-source SDKs and contribute to the FounderMail ecosystem on GitHub.

FounderMail Organization

Browse all FounderMail repositories and SDKs on GitHub.

.NET SDK

C# client library for the FounderMail API.

Python SDK

Complete Python client generated from OpenAPI specification.

Node.js SDK

TypeScript/JavaScript SDK for managing test mailboxes.

Java SDK

Java client library for FounderMail API integration.

What's Next?

AI Agents & MCP →

Give your agent an email address: MCP tools, OTP extraction, and persistent agent identities.

Getting Started →

Choose your path: AI agents, integration testing, or manual email testing.

API Reference →

Explore our REST API endpoints and learn how to integrate FounderMail into your applications.