Welcome to Zenkai
Open-source email platform for developers
What is Zenkai?
Zenkai is an open-source email platform designed for developers who need a powerful, scalable solution for transactional and marketing emails. Built to handle millions of contacts, it provides everything you need to manage your email communications — sending, automation, segmentation, deliverability, and analytics.
Key Features
Transactional Emails
Send transactional emails via API with template support and variable substitution
Email Campaigns
Create and send one-time email broadcasts to your contacts with advanced scheduling
Marketing Automation
Build automated email sequences with visual workflow builder and conditional logic
Contact Management
Manage millions of contacts with custom fields and CSV import capabilities
Dynamic Segmentation
Create dynamic audience segments based on contact data and behavior
Email Templates
Create reusable email templates for transactional and marketing emails
Event Tracking
Track events and use them to trigger workflows and segment audiences
Billing
Understand Zenkai's billing model and pricing
Quick Links
API Reference
Explore the complete API documentation
Self-Hosting
Deploy Zenkai on your own infrastructure
Domain Verification
Learn how to verify your domains for sending emails
API Keys
Manage your API keys and authentication
Open Source
Zenkai is fully open-source and available on GitHub. Contributions are welcome!
Support
If you need help or have questions:
- Read the documentation
- Check the GitHub repository
- Join our Discord community