Introduction
Welcome to the SendLib documentation. Learn how to connect your Gmail via OAuth and send transactional emails using our REST API.
What is SendLib?
SendLib removes the friction of configuring ancient SMTP ports, storing risky App Passwords, and managing strict firewall rules. By using secure Google OAuth2 flows, you grant SendLib temporary, revokable access to relay messages securely through your own connected Gmail accounts.
Secure by Default
We never see your Google password. You use a standard Bearer API key to authorize request calls.
API-First Design
Send transactional emails instantly from any cloud hosting environment with a single HTTP POST request.
Zero Domain Required (Custom Domains Supported)
No DNS, MX, or SPF records needed. Connect @gmail.com or your custom domain Google Workspace account to send instantly.
High Daily Limits
Send up to 500 emails per day for free personal Gmail accounts, or up to 2,000 for Google Workspace.
Ready to get started?
Follow our 5-minute Quick Start guide to connect your account, generate your first API key, and send a test email.