How do I install the Resend Email skill?

Run npx skillmds@latest add dvcrn/resend-email-2 in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Resend Email safe to use?

This skill has not completed SkillMD's automated safety review yet. Independent scanners report: SkillSpector: PASS, Skill Scanner: PASS. Capability flags: executes scripts, makes network calls. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Resend Email?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Resend Email free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Resend Email?

dvcrn (@dvcrn) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Resend Email by dvcrn — Agent Skill

Name: Resend Email
Rating: 4.2 (5 reviews)
Author: dvcrn

Resend Email

Send emails using Resend API. Use when the user needs to send emails without configuring SMTP servers. Supports text and HTML emails, multiple recipients, CC/BCC, and bulk sending. Ideal for notifications, alerts, newsletters, and automated email workflows.

dvcrn Updated Sep 9, 2026 32 repo stars

File contents

Resend Email Sender

Send emails via Resend API - no SMTP configuration needed.

Quick Start

1. Configure

Set environment variables in .env:

RESEND_API_KEY=your_resend_api_key
RESEND_FROM=onboarding@resend.dev  # Optional, defaults to Resend test domain

Get API key at https://resend.com

2. Send Email

openclaw run resend-email \
  --to="recipient@example.com" \
  --subject="Hello" \
  --text="Plain text message"

Usage

Basic Text Email

openclaw run resend-email \
  --to="user@example.com" \
  --subject="Notification" \
  --text="Your task is complete."

HTML Email

openclaw run resend-email \
  --to="user@example.com" \
  --subject="Welcome" \
  --html="<h1>Welcome!</h1><p>Thanks for joining.</p>"

Multiple Recipients

openclaw run resend-email \
  --to="user1@example.com,user2@example.com,user3@example.com" \
  --subject="Team Update" \
  --text="Meeting at 3 PM."

CC and BCC

openclaw run resend-email \
  --to="primary@example.com" \
  --cc="manager@example.com" \
  --bcc="archive@example.com" \
  --subject="Report" \
  --text="Please find the attached report."

From Agent

When agent needs to send email:

# Use exec to call the skill
exec openclaw run resend-email \
  --to="recipient@example.com" \
  --subject="Automated Notification" \
  --text="This email was sent automatically by the agent."

Configuration Options

Variable	Required	Default	Description
`RESEND_API_KEY`	Yes	-	Your Resend API key
`RESEND_FROM`	No	`onboarding@resend.dev`	Default sender address

Sender Addresses

Test domain: onboarding@resend.dev (default, no setup required)
Custom domain: noreply@yourdomain.com (requires domain verification in Resend dashboard)

Limitations

Attachments not supported (Resend API requires base64 encoding)
Rate limits apply based on Resend plan
Email size limits per Resend documentation

Troubleshooting

"RESEND_API_KEY not configured"

Set RESEND_API_KEY in .env file or environment

"Failed to send email: Unauthorized"

Check API key is correct and active
Verify API key has email sending permission

"Failed to send email: Bad Request"

Check recipient email format is valid
Verify from address is verified (for custom domains)

Resources

scripts/send_email.py - Main email sending script

---name: resend-email-2description: Send emails using Resend API. Use when the user needs to send emails without configuring SMTP servers. Supports text and HTML emails, multiple recipients, CC/BCC, and bulk sending. Ideal for notifications, alerts, newsletters, and automated email workflows.--- # Resend Email Sender Send emails via Resend API - no SMTP configuration needed. ## Quick Start ### 1. Configure Set environment variables in `.env`: ```bash RESEND_API_KEY=your_resend_api_key RESEND_FROM=onboarding@resend.dev # Optional, defaults to Resend test domain ``` Get API key at https://resend.com ### 2. Send Email ```bash openclaw run resend-email \ --to="recipient@example.com" \ --subject="Hello" \ --text="Plain text message" ``` ## Usage ### Basic Text Email ```bash openclaw run resend-email \ --to="user@example.com" \ --subject="Notification" \ --text="Your task is complete." ``` ### HTML Email ```bash openclaw run resend-email \ --to="user@example.com" \ --subject="Welcome" \ --html="<h1>Welcome!</h1><p>Thanks for joining.</p>" ``` ### Multiple Recipients ```bash openclaw run resend-email \ --to="user1@example.com,user2@example.com,user3@example.com" \ --subject="Team Update" \ --text="Meeting at 3 PM." ``` ### CC and BCC ```bash openclaw run resend-email \ --to="primary@example.com" \ --cc="manager@example.com" \ --bcc="archive@example.com" \ --subject="Report" \ --text="Please find the attached report." ``` ### From Agent When agent needs to send email: ```bash # Use exec to call the skill exec openclaw run resend-email \ --to="recipient@example.com" \ --subject="Automated Notification" \ --text="This email was sent automatically by the agent." ``` ## Configuration Options | Variable | Required | Default | Description | |----------|----------|---------|-------------| | `RESEND_API_KEY` | Yes | - | Your Resend API key | | `RESEND_FROM` | No | `onboarding@resend.dev` | Default sender address | ## Sender Addresses - **Test domain**: `onboarding@resend.dev` (default, no setup required) - **Custom domain**: `noreply@yourdomain.com` (requires domain verification in Resend dashboard) ## Limitations - Attachments not supported (Resend API requires base64 encoding) - Rate limits apply based on Resend plan - Email size limits per Resend documentation ## Troubleshooting **"RESEND_API_KEY not configured"** - Set `RESEND_API_KEY` in `.env` file or environment **"Failed to send email: Unauthorized"** - Check API key is correct and active - Verify API key has email sending permission **"Failed to send email: Bad Request"** - Check recipient email format is valid - Verify `from` address is verified (for custom domains) ## Resources - `scripts/send_email.py` - Main email sending script

Frequently asked questions