MailLinter is a comprehensive email testing tool designed specifically for developers, offering AI-powered analysis to ensure optimal email deliverability and compatibility. It combines multiple testing methodologies into a single, easy-to-use platform that runs locally via Docker, keeping your email content private.
Key Features
- AI-Powered Deliverability Analysis: Integrates with GPT-4o and Claude to synthesize spam scores, accessibility issues, and compatibility problems into prioritized, actionable recommendations with a unified Deliverability Score.
- Comprehensive Email Testing: Tests emails across 15+ email clients covering 95.7% of market share, including Gmail, Outlook, Apple Mail, Yahoo Mail, and more.
- Spam Detection: Uses Apache SpamAssassin to provide detailed spam score breakdowns and specific recommendations to improve inbox placement.
- Accessibility Compliance: Automatically checks HTML emails against WCAG 2.0 accessibility guidelines, identifying issues like missing alt text, improper heading hierarchy, and insufficient color contrast.
- Docker-Based Deployment: Runs with a single Docker command (
docker run nunomsde/maillinter) and requires zero configuration, ready in under 30 seconds. - CSS Support Matrix: Provides live analysis of CSS compatibility across major email clients, showing exactly what renders and what doesn't.
- Actionable Fixes: Offers ready-to-use code snippets for each compatibility issue, helping developers implement solutions quickly.
- REST API: Enables integration into CI/CD pipelines for automated email testing before production deployment.
Use Cases
- Developers building email functionality into applications who need to ensure emails render correctly across different clients.
- Marketing teams creating email campaigns who want to optimize deliverability and accessibility.
- QA engineers implementing automated email testing in their development pipelines.
- Accessibility-focused organizations ensuring their email communications comply with WCAG standards.
- Startups and small businesses looking for a free, comprehensive email testing solution without the complexity of enterprise tools.
MailLinter's unique combination of AI synthesis with traditional email testing tools provides insights that go beyond individual issue checking, helping developers ship emails that look great everywhere and reach the inbox reliably.
