Resend Email Integration

Resend is a modern email API service that provides reliable email delivery with excellent developer experience and powerful features.

Environment Variables

Required Server Variables

RESEND_API_KEY=re_... # Your Resend API key

Optional Server Variables

RESEND_AUDIENCE_ID=your_audience_id # For audience management
RESEND_FROM_EMAIL=noreply@yourdomain.com # Default from email

Setup Instructions

  1. Create a Resend Account: Sign up at resend.com if you haven't already

  2. Verify Your Domain:

    • Go to your Resend Dashboard
    • Navigate to "Domains"
    • Add and verify your domain for sending emails

  3. Get Your API Key:

    • In your dashboard, go to "API Keys"
    • Create a new API key
    • Copy the key (starts with re_)

  4. Add Environment Variables:

    RESEND_API_KEY=re_your_api_key_here
RESEND_FROM_EMAIL=noreply@yourdomain.com

Features Enabled

When these environment variables are configured, the following features become available:

  • ✅ Transactional email sending
  • ✅ Email templates and personalization
  • ✅ Bounce and complaint handling
  • ✅ Email analytics and tracking
  • ✅ Contact list management
  • ✅ A/B testing for emails
  • ✅ Webhook notifications
  • ✅ SMTP relay support

Configuration Options

Advanced Configuration

You can customize Resend behavior:

# Webhook configuration
RESEND_WEBHOOK_SECRET=your_webhook_secret

# Email configuration
RESEND_FROM_NAME=Your App Name

# Rate limiting
RESEND_RATE_LIMIT=100 # emails per hour

Email Templates

Resend supports various email formats:

  • Transactional Emails: Order confirmations, password resets
  • Marketing Emails: Newsletters, promotions
  • HTML Templates: Rich email designs
  • Plain Text: Simple text emails

Integration with Authentication

Resend integrates with authentication systems:

  • Welcome emails for new users
  • Password reset emails
  • Email verification
  • Magic link authentication
  • Account notifications

Testing

Resend provides comprehensive testing capabilities:

  • Test mode for development
  • Email preview and testing
  • Spam testing tools
  • Delivery testing
  • Analytics dashboard

Production Deployment

Before going live:

  1. Ensure domain verification and DNS setup
  2. Configure proper SPF, DKIM, and DMARC records
  3. Set up webhook endpoints for bounce handling
  4. Configure rate limiting and sending limits
  5. Review email content and compliance
  6. Set up proper monitoring and alerts
  7. Configure backup email service if needed