# Resend

> Send emails through Resend's official MCP server. Supports single send, batch send, HTML and plain text bodies, attachments, CC/BCC, scheduling, and contact management.

- Skill: `renatoasse/resend` (Agent Skill)
- Install (CLI): `npx skillmds@latest add renatoasse/resend`
- Raw SKILL.md: https://api.skillmd.com/api/skills/renatoasse/resend/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: renatoasse (https://skillmd.com/u/renatoasse)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/renatoasse/resend

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# Resend — Email Skill

## When to use

Use this skill when a squad needs to send emails — welcome messages, notifications,
reports, newsletters, or any transactional/marketing email. Resend handles delivery
so the squad only needs to compose the content and call the MCP tools.

## Instructions

### Sending a single email

1. Prepare **from**, **to**, **subject**, and **body** (HTML or plain text).
2. Call the Resend MCP `send_email` tool.
3. Check the response for a successful `id` — that confirms the email was queued.

### Sending a batch

1. Build an array of email objects (same fields as single send).
2. Call the Resend MCP `batch_send_emails` tool.
3. Each item in the response will have its own `id` or error.

### Attachments

Pass attachments as an array with `filename`, `path` (local file), `url`, or `content` (base64).

### Scheduling

Include a `scheduled_at` field (ISO 8601 datetime) to schedule future delivery.

## Best practices

- Validate **from** against a verified domain before sending — Resend rejects unverified senders.
- Keep subject lines under 80 characters for better deliverability.
- For batch sends, group by shared content to reduce payload size.
- Always check the response for errors and surface them to the user rather than silently failing.
- When composing HTML emails, keep the markup simple — most email clients ignore complex CSS.

## Available operations

- **Send Email** — Single email with HTML/text body, attachments, CC/BCC, reply-to
- **Batch Send** — Multiple emails in one call
- **Schedule Email** — Queue an email for future delivery
- **List/Get Emails** — Check delivery status of sent emails
- **Cancel Email** — Cancel a scheduled email before it sends
- **Manage Contacts** — Create, list, update, and remove contacts from audiences
- **Manage Domains** — Add and verify sender domains

## Setup

1. Create a free account at [resend.com](https://resend.com)
2. Generate an API key (starts with `re_`)
3. Add a verified sender domain (or use Resend's shared `onboarding@resend.dev` for testing)
4. Set `RESEND_API_KEY` in your `.env` file