Introduction
Lettr is the email API for developers. Build reliable email delivery into your applications with our simple, powerful API.PHP Quickstart
Get started with Lettr using PHP
Node.js Quickstart
Get started with Lettr using Node.js
SMTP Quickstart
Connect via SMTP protocol
Serverless
Deploy on serverless platforms
Explore
Discover the full range of features and capabilities.Emails
Visualize all the activity in your account.
Domains
Ensure deliverability of your emails.
Webhooks
Notify your application about email events.
Why Lettr?
Developer-First Experience
Developer-First Experience
Clean APIs, comprehensive SDKs, and detailed documentation designed for developers.
High Deliverability
High Deliverability
Optimized infrastructure to ensure your emails reach the inbox, not spam.
Real-Time Analytics
Real-Time Analytics
Track opens, clicks, bounces, and more with webhooks and dashboard analytics.
Flexible Integration
Flexible Integration
Use our API, SDKs, or SMTP relay — integrate however suits your stack.