resend

Transactional emails via REST API use authenticated HTTP requests with your API key and JSON payloads to deliver emails reliably. Resend handles sending from a specified address to recipients with HTML or text content, supporting features like scheduling, CC/BCC, and reply-to fields for welcome emails, password resets, and notifications.

You need a Resend API key for authentication, proper environment variable handling to store it securely, and a verified sending domain. The API key enables authenticated REST requests, and domain verification ensures deliverability and prevents emails from landing in spam folders.

Yes, Resend supports batch sends and scheduled deliveries through its REST API. You can send multiple emails in a single batch operation and schedule deliveries for future times, making it suitable for campaigns, bulk notifications, and time-sensitive communications.

Resend's REST API lets you manage contacts and sending domains through authenticated requests. You can add and organize contacts, verify new domains for sending, and track delivery status across all outgoing emails from your verified domains.

Resend provides delivery tracking capabilities through its REST API, allowing you to monitor email status and receipt. The platform tracks bounces, delivery failures, and other metrics to help you maintain sender reputation and diagnose delivery issues.

Store your Resend API key in environment variables rather than hardcoding it in your application. Proper environment variable handling ensures your credentials remain secure, prevents accidental exposure in version control, and allows safe configuration across development, staging, and production environments.