🎯

resend

🎯Skill

from vm0-ai/vm0-skills

What it does

Sends transactional emails, manages contacts, and handles email domains using Resend's API with simple curl commands.

📦

Part of

vm0-ai/vm0-skills(138 items)

resend

Installation

Add MarketplaceAdd marketplace to Claude Code

/plugin marketplace add vm0-ai/vm0-skills

Install PluginInstall plugin from marketplace

/plugin install notion@vm0-skills

Install PluginInstall plugin from marketplace

/plugin install slack-webhook@vm0-skills

git cloneClone repository

git clone https://github.com/vm0-ai/vm0-skills.git

📖 Extracted from docs: vm0-ai/vm0-skills

Need more details? View full documentation on GitHub →

15Installs

AddedFeb 4, 2026

View on GitHub Back to Skills

Skill Details

SKILL.md

Resend email API via curl. Use this skill to send transactional emails, manage contacts, domains, and API keys.

Overview

# Resend Email API

Send transactional emails, manage contacts, and domains via Resend's REST API.

> Official docs: https://resend.com/docs/api-reference/introduction

---

When to Use

Use this skill when you need to:

Send transactional emails (welcome, password reset, notifications)
Send batch emails to multiple recipients
Manage email contacts and audiences
Verify and manage sending domains
Track email delivery status

---

Prerequisites

Sign up at https://resend.com
Go to API Keys: https://resend.com/api-keys
Create a new API key

Set environment variable:

```bash

export RESEND_API_KEY="re_xxxxxxxxx"

```

> Important: When using $VAR in a command that pipes to another command, wrap the command containing $VAR in bash -c '...'. Due to a Claude Code bug, environment variables are silently cleared when pipes are used directly.

> Placeholders: Values in {curly-braces} like {email-id} are placeholders. Replace them with actual values when executing.

---

Emails

Send Email

Write to /tmp/resend_request.json:

```json

{

"from": "Acme ",

"to": [""],

"subject": "",

"html": "

}

```

Then run:

```bash

bash -c 'curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

```

Send Email with Plain Text

Write to /tmp/resend_request.json:

```json

{

"from": "Acme ",

"to": [""],

"subject": "",

"text": ""

}

```

Then run:

```bash

bash -c 'curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

```

Send Email with CC/BCC

Write to /tmp/resend_request.json:

```json

{

"from": "Acme ",

"to": [""],

"cc": [""],

"bcc": [""],

"subject": "",

"html": "

}

```

Then run:

```bash

bash -c 'curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

```

Send Email with Reply-To

Write to /tmp/resend_request.json:

```json

{

"from": "Acme ",

"to": [""],

"replyTo": "",

"subject": "",

"html": "

}

```

Then run:

```bash

bash -c 'curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

```

Send Scheduled Email

Schedule email using natural language or ISO 8601 format:

Write to /tmp/resend_request.json:

```json

{

"from": "Acme ",

"to": [""],

"subject": "",

"html": "

"scheduledAt": "in 1 hour"

}

```

Then run:

```bash

bash -c 'curl -s -X POST "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

```

Send Batch Emails

Send up to 100 emails in a single request:

Write to /tmp/resend_request.json:

```json

[

{

"from": "Acme ",

"to": [""],

"subject": "Hello 1",

"html": "

Email 1

{

"from": "Acme ",

"to": [""],

"subject": "Hello 2",

"html": "

Email 2

}

]

```

Then run:

```bash

bash -c 'curl -s -X POST "https://api.resend.com/emails/batch" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

```

Retrieve Email

```bash

bash -c 'curl -s "https://api.resend.com/emails/" --header "Authorization: Bearer $RESEND_API_KEY"'

```

List Sent Emails

```bash

bash -c 'curl -s "https://api.resend.com/emails" --header "Authorization: Bearer $RESEND_API_KEY"'

```

Cancel Scheduled Email

```bash

bash -c 'curl -s -X POST "https://api.resend.com/emails//cancel" --header "Authorization: Bearer $RESEND_API_KEY"'

```

---

Contacts

Create Contact

Write to /tmp/resend_request.json:

```json

{

"email": "",

"firstName": "",

"lastName": "",

"unsubscribed": false

}

```

Then run:

```bash

bash -c 'curl -s -X POST "https://api.resend.com/contacts" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

```

Create Contact with Custom Properties

Write to /tmp/resend_request.json:

```json

{

"email": "",

"firstName": "",

"lastName": "",

"properties": {

"company": "",

"role": ""

}

```

Then run:

```bash

bash -c 'curl -s -X POST "https://api.resend.com/contacts" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

```

Retrieve Contact

```bash

bash -c 'curl -s "https://api.resend.com/contacts/" --header "Authorization: Bearer $RESEND_API_KEY"'

```

List Contacts

```bash

bash -c 'curl -s "https://api.resend.com/contacts" --header "Authorization: Bearer $RESEND_API_KEY"'

```

List Contacts with Pagination

```bash

bash -c 'curl -s "https://api.resend.com/contacts?limit=50" --header "Authorization: Bearer $RESEND_API_KEY"'

```

Update Contact

Write to /tmp/resend_request.json:

```json

{

"firstName": "",

"unsubscribed": true

}

```

Then run:

```bash

bash -c 'curl -s -X PATCH "https://api.resend.com/contacts/" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

```

Delete Contact

```bash

bash -c 'curl -s -X DELETE "https://api.resend.com/contacts/" --header "Authorization: Bearer $RESEND_API_KEY"'

```

---

Domains

List Domains

```bash

bash -c 'curl -s "https://api.resend.com/domains" --header "Authorization: Bearer $RESEND_API_KEY"'

```

Retrieve Domain

```bash

bash -c 'curl -s "https://api.resend.com/domains/" --header "Authorization: Bearer $RESEND_API_KEY"'

```

Create Domain

Write to /tmp/resend_request.json:

```json

{

"name": ""

}

```

Then run:

```bash

bash -c 'curl -s -X POST "https://api.resend.com/domains" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

```

Verify Domain

```bash

bash -c 'curl -s -X POST "https://api.resend.com/domains//verify" --header "Authorization: Bearer $RESEND_API_KEY"'

```

Delete Domain

```bash

bash -c 'curl -s -X DELETE "https://api.resend.com/domains/" --header "Authorization: Bearer $RESEND_API_KEY"'

```

---

API Keys

List API Keys

```bash

bash -c 'curl -s "https://api.resend.com/api-keys" --header "Authorization: Bearer $RESEND_API_KEY"'

```

Create API Key

Write to /tmp/resend_request.json:

```json

{

"name": ""

}

```

Then run:

```bash

bash -c 'curl -s -X POST "https://api.resend.com/api-keys" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

```

Create API Key with Permissions

Write to /tmp/resend_request.json:

```json

{

"name": "",

"permission": "sending_access"

}

```

Then run:

```bash

bash -c 'curl -s -X POST "https://api.resend.com/api-keys" --header "Authorization: Bearer $RESEND_API_KEY" --header "Content-Type: application/json" -d @/tmp/resend_request.json'

```

Delete API Key

```bash

bash -c 'curl -s -X DELETE "https://api.resend.com/api-keys/" --header "Authorization: Bearer $RESEND_API_KEY"'

```

---

Email Parameters Reference

| Parameter | Type | Description |

|-----------|------|-------------|

| from | string | Sender email (required). Format: "Name " |

| to | string[] | Recipients (required). Max 50 addresses |

| subject | string | Email subject (required) |

| html | string | HTML content |

| text | string | Plain text content |

| cc | string[] | CC recipients |

| bcc | string[] | BCC recipients |

| replyTo | string | Reply-to address |

| scheduledAt | string | Schedule time (ISO 8601 or natural language) |

| tags | array | Custom tags for tracking |

| attachments | array | File attachments (max 40MB total) |

---

Response Codes

| Status | Description |

|--------|-------------|

| 200 | Success |

| 400 | Invalid parameters |

| 401 | Missing API key |

| 403 | Invalid API key |

| 404 | Resource not found |

| 429 | Rate limit exceeded (2 req/sec) |

| 5xx | Server error |

---

Guidelines

Rate Limits: Default is 2 requests per second; implement backoff for 429 errors
Sender Domain: Use verified domains for production; onboarding@resend.dev for testing
Batch Emails: Use /emails/batch for sending to multiple recipients efficiently
Idempotency: Use Idempotency-Key header to prevent duplicate sends
Scheduling: Use natural language (in 1 hour) or ISO 8601 format for scheduledAt

---

API Reference

Documentation: https://resend.com/docs/api-reference/introduction
Dashboard: https://resend.com/overview
API Keys: https://resend.com/api-keys
Domains: https://resend.com/domains

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