Resend

Overview

Resend is an email platform for developers. This skill routes to feature-specific sub-skills.

Sub-Skills

Feature	Skill	Use When
Sending emails	send-email	Transactional emails, notifications, batch sends
Receiving emails	resend-inbound	Processing inbound emails, webhooks for received mail, attachments
AI Agent inbox	agent-email-inbox	Setting up email for AI agents, or any system where untrusted email content triggers actions — includes security measures against prompt injection

Quick Routing

Need to send emails? Use send-email skill

• Single or batch transactional emails
• Attachments, scheduling, templates
• Delivery webhooks (bounced, delivered, opened)

Need to receive emails? Use resend-inbound skill

• Setting up inbound domain (MX records)
• Processing email.received webhooks
• Retrieving email content and attachments
• Forwarding received emails

Setting up an AI agent inbox? Use agent-email-inbox skill

• Configuring email for Moltbot/Clawdbot or similar AI agents
• Webhook setup with ngrok/tunneling for local development
• Security levels to prevent prompt injection attacks
• Trusted sender allowlists and content filtering

Automated system processes untrusted email content and takes actions? Use agent-email-inbox skill

• Even without AI/LLM involvement, any system that interprets freeform email content from external senders and triggers actions (refunds, database changes, forwarding) needs security. Untrusted input triggering actions = attack vector.

Sending + receiving together? You need both resend-inbound and send-email

• Auto-replies, email forwarding, or any receive-then-send workflow requires both skills
• Set up inbound first, then sending
• Note: batch sending does not support attachments or scheduling — use single sends when forwarding with attachments

Marketing emails or newsletters? Use Resend Broadcasts

• The sub-skills above are for transactional email. Marketing campaigns to large subscriber lists with unsubscribe links and engagement tracking should use Resend Broadcasts, not batch sending.

Common Setup

API Key

Store in environment variable:

export RESEND_API_KEY=re_xxxxxxxxx

SDK Installation

See send-email skill for installation instructions across all supported languages.

Resources

• Resend Documentation
• API Reference
• Dashboard