Professional Email Testing
Made Simple
Test HTML emails, validate spam scores with SpamAssassin, check compatibility across 15+ email clients. The complete email testing platform for developers and email marketers.
Quick start in one command:
docker run -p 2525:2525 -p 8547:8547 nunomsde/maillinter:latestThen open http://localhost:8547 in your browser
See MailLinter in Action
Experience the complete email testing workflow. From sending your first test email to analyzing deliverability across 15+ email clients.
Everything You Need for Email Testing
From SMTP capture to spam analysis, from compatibility testing to professional reporting. MailLinter provides a complete email testing ecosystem.
Professional SMTP Testing
Capture emails on port 2525 with advanced MIME parsing and attachment support
SpamAssassin Integration
Industry-standard spam detection with real-time scoring and rule categorization
15+ Email Client Compatibility
Test compatibility across Outlook, Gmail, Apple Mail, Yahoo, Thunderbird and more
Responsive Email Preview
Preview emails on desktop, tablet, and mobile with real-time rendering
CSS/HTML Validation
Advanced parsing with actionable compatibility warnings and suggestions
Link Validation
Automatic validation of email links with response times and status codes
Docker Ready
Multi-architecture Docker support (amd64/arm64) with one-command deployment
API Access
Access the MailLinter API to integrate with your own applications
Built-in testing tools
Built-in testing tools to help you test your email
Why Choose MailLinter?
Built by email experts for email professionals. No complex setup, no recurring costs, just powerful email testing.
Lightning Fast Setup
One Docker command and you're testing emails in seconds
Universal Compatibility
Works on any platform with Docker support
Team Ready WIP
Share results and collaborate on email quality
AI-Powered Insights WIP
AI-powered insights to help you improve your email deliverability and understanding of your email data
Test Against 15+ Email Clients
Ensure your emails look perfect across all major email clients with our comprehensive compatibility testing.
Client Support Matrix
Comprehensive Testing
- CSS property compatibility analysis
- HTML element support validation
- Media query responsiveness testing
- Link validation with response times
- Image and attachment compatibility
Market Coverage
Combined market share coverage across all supported email clients, ensuring your emails reach virtually every recipient.
Analysis on email arrival
Scores by market share
Suggestions for fixes
SpamAssassin Integration
Built-in SpamAssassin integration provides professional spam analysis with detailed rule breakdowns and actionable insights to improve email deliverability.
Real-time Spam Scoring
Performance Metrics
Rule Categories
Bayes
Bayesian spam probability analysis
Authentication
DKIM, SPF, DMARC validation
DNS/RBL
DNS blacklist checking
Content
Message content analysis
Headers
Email header validation
Network
Network-based tests
Bundled Installation
SpamAssassin comes pre-configured and ready to use. No separate installation required.
Docker
Automatic installation with consistent environment across all platforms
Secure by Design
SpamAssassin is a secure and reliable email filtering system that is designed to protect your email from spam and malware.
Optimized Config
Pre-tuned configuration for email testing environments
Get Started in Minutes
Choose your preferred installation method. All options include SpamAssassin and are production-ready.
Docker Run (Fastest)
Pull and run from Docker Hub - no setup needed
docker run -d --name maillinter \
-p 2525:2525 -p 8547:8547 \
nunomsde/maillinter:latest✅ Advantages
- No building required
- Multi-architecture support
- Instant start
What's Next?
Configure Your App
Point your application to send emails to localhost:2525
Send Test Emails
Use the web interface to send test emails or trigger from your application
Analyze Results
View compatibility reports, spam scores, and get actionable insights