🌍
Cross-runtime
Works seamlessly on Node.js, Deno, Bun, and edge functions with consistent API.
UpyoSimple and modern email sending library
Universal interface for emailing across runtimes
Skip to content
🎮
Dead simple
Intuitive API for sending emails with just a few lines of code.
🛡️
Type-safe
TypeScript-first design with discriminated unions for compile-time error handling safety.
🪶
Lightweight
Zero dependencies and minimal footprint for fast integration.
🧪
Built for testing
Comprehensive mock transport for reliable testing without sending real emails.
🔄
Provider independence
Switch between SMTP, Mailgun, Resend, SendGrid, Amazon SES, and other providers without code changes.
Are you an LLM? View /llms.txt for optimized Markdown documentation, or /llms-full.txt for full documentation bundle