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claude-codeopenclawautomation

Skills 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.

install
source · Clone the upstream repo
git clone https://github.com/openclaw/skills
Claude Code · Install into ~/.claude/skills/
T=$(mktemp -d) && git clone --depth=1 https://github.com/openclaw/skills "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/aprilvkuo/resend-email-sender" ~/.claude/skills/openclaw-skills-resend-email && rm -rf "$T"
OpenClaw · Install into ~/.openclaw/skills/
T=$(mktemp -d) && git clone --depth=1 https://github.com/openclaw/skills "$T" && mkdir -p ~/.openclaw/skills && cp -r "$T/skills/aprilvkuo/resend-email-sender" ~/.openclaw/skills/openclaw-skills-resend-email && rm -rf "$T"
manifest: skills/aprilvkuo/resend-email-sender/SKILL.md
tags
#email#api#notification#automation#resend
source content

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

VariableRequiredDefaultDescription
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