mailgun

Send emails via Mailgun API. Use when the user needs to send emails programmatically, such as newsletters, notifications, alerts, or automated reports. Requires MAILGUN_API_KEY and MAILGUN_DOMAIN environment variables to be configured.

3,891 stars

byopenclaw

View on GitHub Installation ↓

Best use case

mailgun is best used when you need a repeatable AI agent workflow instead of a one-off prompt.

Teams using mailgun should expect a more consistent output, faster repeated execution, less prompt rewriting.

When to use this skill

You want a reusable workflow that can be run more than once with consistent structure.

When not to use this skill

You only need a quick one-off answer and do not need a reusable workflow.
You cannot install or maintain the underlying files, dependencies, or repository context.

Installation

Claude Code / Cursor / Codex

$curl -o ~/.claude/skills/mailgun/SKILL.md --create-dirs "https://raw.githubusercontent.com/openclaw/skills/main/skills/alphafactor/mailgun/SKILL.md"

Manual Installation

Download SKILL.md from GitHub
Place it in .claude/skills/mailgun/SKILL.md inside your project
Restart your AI agent — it will auto-discover the skill

How mailgun Compares

Feature / Agent	mailgun	Standard Approach
Platform Support	Not specified	Limited / Varies
Context Awareness	High	Baseline
Installation Complexity	Unknown	N/A

Frequently Asked Questions

What does this skill do?

Where can I find the source code?

You can find the source code on GitHub using the link provided at the top of the page.

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SKILL.md Source

# Mailgun Email Sender

Send emails programmatically using Mailgun's HTTP API.

## Prerequisites

Configure the following environment variables in `~/.zshrc` or `~/.bash_profile`:

```bash
export MAILGUN_API_KEY="key-xxxxx"      # Your Mailgun private API key
export MAILGUN_DOMAIN="mg.yourdomain.com"  # Your Mailgun domain
export MAILGUN_FROM="Sender <noreply@mg.yourdomain.com>"  # Default sender
export MAILGUN_DEFAULT_TO="you@email.com"  # Default recipient (optional)
```

Then reload your shell configuration:
```bash
source ~/.zshrc
```

## Usage

### Send a simple email

```bash
mailgun/scripts/send_email.sh "Subject" "Email body text"
```

### Send to a specific recipient

```bash
mailgun/scripts/send_email.sh "Newsletter" "Content here" "recipient@email.com"
```

### Send with custom sender

```bash
mailgun/scripts/send_email.sh "Alert" "System down" "admin@company.com" "alerts@company.com"
```

## Features

- Simple command-line interface
- Uses environment variables for configuration
- Supports custom sender and recipient
- Returns success/error status codes
- Works with HTML content (pass HTML in body parameter)

## Common Use Cases

- Daily/weekly newsletters
- System alerts and notifications
- Automated reports
- Confirmation emails
- Scheduled reminders

## Troubleshooting

**Error: MAILGUN_API_KEY and MAILGUN_DOMAIN must be set**
→ Configure environment variables as shown in Prerequisites

**Error: 401 Unauthorized**
→ Check that your API key is correct and active

**Error: 404 Not Found**
→ Verify your MAILGUN_DOMAIN is correct

## References

- Mailgun Documentation: https://documentation.mailgun.com/
- API Reference: See [references/api.md](references/api.md)

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