Resend

Resend is a modern email API built for developers. It offers a simple, reliable way to send transactional and marketing emails with excellent deliverability.

Features

• Simple API with great developer experience
• Built-in email analytics and tracking
• React Email support for building templates
• Competitive pricing with generous free tier
• Fast delivery with high deliverability rates

Setup

1. Create a Resend Account

Start by creating an account at resend.com. Resend offers a free tier that includes 3,000 emails per month.

2. Verify Your Domain

For production use, you'll want to verify your sending domain:

1. Go to Domains in the Resend dashboard
2. Click Add Domain and enter your domain name
3. Add the DNS records Resend provides (SPF, DKIM, and optionally DMARC)
4. Wait for verification (usually takes a few minutes)

3. Generate an API Key

1. Go to API Keys in the Resend dashboard
2. Click Create API Key
3. Give it a descriptive name (e.g., "Lunogram Production")
4. Copy the API key - you'll need it for the next step

4. Configure in Lunogram

1. Open your Lunogram project settings

2. Navigate to Integrations and click Add Integration

3. Select Resend from the list of providers

4. Enter your configuration:

   • API Key: Your Resend API key (starts with re_)
   • Default From Address (optional): Default sender email address

5. Click Save to create the provider

Configuration Options

Usage

Once configured, Resend will be available as an email provider when creating campaigns:

1. Create a new campaign or edit an existing one
2. Select Resend as the provider
3. Configure your email template with subject, from address, and content
4. The "from" address must use a verified domain (or the test domain during development)

Email Format

Resend supports both HTML and plain text emails. When creating templates in Lunogram:

• HTML: Rich formatted emails with images, buttons, and styling
• Plain Text: Simple text fallback for email clients that don't support HTML

Best Practices

Use a Verified Domain

While Resend allows sending from their test domain during development, always use a verified custom domain in production for:

• Better deliverability
• Professional appearance
• Brand consistency

Set Up DMARC

In addition to SPF and DKIM (which Resend requires), consider adding a DMARC record to further improve deliverability and protect against spoofing.

Monitor Your Sending Reputation

Use Resend's dashboard to monitor:

• Delivery rates
• Bounce rates
• Spam complaints

High bounce or complaint rates can affect your sending reputation.

Troubleshooting

Emails Not Sending

1. Verify your API key is correct and active
2. Check that the "from" address uses a verified domain
3. Review the Resend dashboard for any error messages

Emails Going to Spam

1. Ensure your domain has proper SPF and DKIM records
2. Consider adding a DMARC policy
3. Avoid spam trigger words in subject lines
4. Include an unsubscribe link in marketing emails

Rate Limits

Resend has rate limits based on your plan. If you're hitting limits:

1. Check your current plan limits in the Resend dashboard
2. Consider upgrading your plan for higher limits
3. Implement rate limiting in your journey designs

Resources

• Resend Documentation
• Resend API Reference
• React Email - Build email templates with React