Imported from LeoYeAI/openclaw-master-skills (skills/mailgun-api/SKILL.md). Install upstream with npx skills add LeoYeAI/openclaw-master-skills --skill mailgun-api. Copyright stays with the author.

Mailgun

Access the Mailgun API with managed OAuth authentication. Send transactional emails, manage domains, routes, templates, mailing lists, suppressions, and webhooks.

Quick Start

# List domains
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailgun/v3/domains')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Base URL

https://gateway.maton.ai/mailgun/v3/{resource}

Replace {resource} with the actual Mailgun API endpoint path. The gateway proxies requests to api.mailgun.net/v3 (US region) and automatically injects your OAuth token.

Regional Note: Mailgun has US and EU regions. The gateway defaults to US region (api.mailgun.net).

Authentication

All requests require the Maton API key in the Authorization header:

Authorization: Bearer $MATON_API_KEY

Environment Variable: Set your API key as MATON_API_KEY:

export MATON_API_KEY="YOUR_API_KEY"

Getting Your API Key

1. Sign in or create an account at maton.ai
2. Go to maton.ai/settings
3. Copy your API key

Connection Management

Manage your Mailgun OAuth connections at https://ctrl.maton.ai.

List Connections

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections?app=mailgun&status=ACTIVE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Connection

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'app': 'mailgun'}).encode()
req = urllib.request.Request('https://ctrl.maton.ai/connections', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "connection": {
    "connection_id": "78b5a036-c621-40c2-b74b-276195735af2",
    "status": "ACTIVE",
    "creation_time": "2026-02-12T02:24:16.551210Z",
    "last_updated_time": "2026-02-12T02:25:03.542838Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "mailgun",
    "metadata": {}
  }
}

Open the returned url in a browser to complete OAuth authorization.

Delete Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}', method='DELETE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Specifying Connection

If you have multiple Mailgun connections, specify which one to use with the Maton-Connection header:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailgun/v3/domains')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', '78b5a036-c621-40c2-b74b-276195735af2')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

If omitted, the gateway uses the default (oldest) active connection.

API Reference

Important: Mailgun API uses application/x-www-form-urlencoded for POST/PUT requests, not JSON.

Domains

List Domains

GET /mailgun/v3/domains

Returns all domains for the account.

Get Domain

GET /mailgun/v3/domains/{domain_name}

Create Domain

POST /mailgun/v3/domains
Content-Type: application/x-www-form-urlencoded

name=example.com&smtp_password=supersecret

Delete Domain

DELETE /mailgun/v3/domains/{domain_name}

Messages

Send Message

POST /mailgun/v3/{domain_name}/messages
Content-Type: application/x-www-form-urlencoded

from=sender@example.com&to=recipient@example.com&subject=Hello&text=Hello World

Parameters:

• from (required) - Sender email address
• to (required) - Recipient(s), comma-separated
• cc - CC recipients
• bcc - BCC recipients
• subject (required) - Email subject
• text - Plain text body
• html - HTML body
• template - Name of stored template to use
• o:tag - Tag for tracking
• o:tracking - Enable/disable tracking (yes/no)
• o:tracking-clicks - Enable click tracking
• o:tracking-opens - Enable open tracking
• h:X-Custom-Header - Custom headers (prefix with h:)
• v:custom-var - Custom variables for templates (prefix with v:)

Send MIME Message

POST /mailgun/v3/{domain_name}/messages.mime
Content-Type: multipart/form-data

to=recipient@example.com&message=<MIME content>

Events

List Events

GET /mailgun/v3/{domain_name}/events

Query parameters:

• begin - Start time (RFC 2822 or Unix timestamp)
• end - End time
• ascending - Sort order (yes/no)
• limit - Results per page (max 300)
• event - Filter by event type (accepted, delivered, failed, opened, clicked, unsubscribed, complained, stored)
• from - Filter by sender
• to - Filter by recipient
• tags - Filter by tags

Routes

Routes are defined globally per account, not per domain.

List Routes

GET /mailgun/v3/routes

Query parameters:

• skip - Number of records to skip
• limit - Number of records to return

Create Route

POST /mailgun/v3/routes
Content-Type: application/x-www-form-urlencoded

priority=0&description=My Route&expression=match_recipient(".*@example.com")&action=forward("https://example.com/webhook")

Parameters:

• priority - Route priority (lower = higher priority)
• description - Route description
• expression - Filter expression (match_recipient, match_header, catch_all)
• action - Action(s) to take (forward, store, stop)

Get Route

GET /mailgun/v3/routes/{route_id}

Update Route

PUT /mailgun/v3/routes/{route_id}
Content-Type: application/x-www-form-urlencoded

priority=1&description=Updated Route

Delete Route

DELETE /mailgun/v3/routes/{route_id}

Webhooks

List Webhooks

GET /mailgun/v3/domains/{domain_name}/webhooks

Create Webhook

POST /mailgun/v3/domains/{domain_name}/webhooks
Content-Type: application/x-www-form-urlencoded

id=delivered&url=https://example.com/webhook

Webhook types: accepted, delivered, opened, clicked, unsubscribed, complained, permanent_fail, temporary_fail

Get Webhook

GET /mailgun/v3/domains/{domain_name}/webhooks/{webhook_type}

Update Webhook

PUT /mailgun/v3/domains/{domain_name}/webhooks/{webhook_type}
Content-Type: application/x-www-form-urlencoded

url=https://example.com/new-webhook

Delete Webhook

DELETE /mailgun/v3/domains/{domain_name}/webhooks/{webhook_type}

Templates

List Templates

GET /mailgun/v3/{domain_name}/templates

Create Template

POST /mailgun/v3/{domain_name}/templates
Content-Type: application/x-www-form-urlencoded

name=my-template&description=Welcome email&template=<html><body>Hello {{name}}</body></html>

Get Template

GET /mailgun/v3/{domain_name}/templates/{template_name}

Delete Template

DELETE /mailgun/v3/{domain_name}/templates/{template_name}

Mailing Lists

List Mailing Lists

GET /mailgun/v3/lists/pages

Create Mailing List

POST /mailgun/v3/lists
Content-Type: application/x-www-form-urlencoded

address=newsletter@example.com&name=Newsletter&description=Monthly newsletter&access_level=readonly

Access levels: readonly, members, everyone

Get Mailing List

GET /mailgun/v3/lists/{list_address}

Update Mailing List

PUT /mailgun/v3/lists/{list_address}
Content-Type: application/x-www-form-urlencoded

name=Updated Newsletter

Delete Mailing List

DELETE /mailgun/v3/lists/{list_address}

Mailing List Members

List Members

GET /mailgun/v3/lists/{list_address}/members/pages

Add Member

POST /mailgun/v3/lists/{list_address}/members
Content-Type: application/x-www-form-urlencoded

address=member@example.com&name=John Doe&subscribed=yes

Get Member

GET /mailgun/v3/lists/{list_address}/members/{member_address}

Update Member

PUT /mailgun/v3/lists/{list_address}/members/{member_address}
Content-Type: application/x-www-form-urlencoded

name=Jane Doe&subscribed=no

Delete Member

DELETE /mailgun/v3/lists/{list_address}/members/{member_address}

Suppressions

Bounces

# List bounces
GET /mailgun/v3/{domain_name}/bounces

# Add bounce
POST /mailgun/v3/{domain_name}/bounces
Content-Type: application/x-www-form-urlencoded

address=bounced@example.com&code=550&error=Mailbox not found

# Get bounce
GET /mailgun/v3/{domain_name}/bounces/{address}

# Delete bounce
DELETE /mailgun/v3/{domain_name}/bounces/{address}

Unsubscribes

# List unsubscribes
GET /mailgun/v3/{domain_name}/unsubscribes

# Add unsubscribe
POST /mailgun/v3/{domain_name}/unsubscribes
Content-Type: application/x-www-form-urlencoded

address=unsubscribed@example.com&tag=*

# Delete unsubscribe
DELETE /mailgun/v3/{domain_name}/unsubscribes/{address}

Complaints

# List complaints
GET /mailgun/v3/{domain_name}/complaints

# Add complaint
POST /mailgun/v3/{domain_name}/complaints
Content-Type: application/x-www-form-urlencoded

address=complainer@example.com

# Delete complaint
DELETE /mailgun/v3/{domain_name}/complaints/{address}

Whitelists

# List whitelists
GET /mailgun/v3/{domain_name}/whitelists

# Add to whitelist
POST /mailgun/v3/{domain_name}/whitelists
Content-Type: application/x-www-form-urlencoded

address=allowed@example.com

# Delete from whitelist
DELETE /mailgun/v3/{domain_name}/whitelists/{address}

Statistics

Get Stats

GET /mailgun/v3/{domain_name}/stats/total?event=delivered&event=opened

Query parameters:

• event (required) - Event type(s): accepted, delivered, failed, opened, clicked, unsubscribed, complained
• start - Start date (RFC 2822 or Unix timestamp)
• end - End date
• resolution - Data resolution (hour, day, month)
• duration - Period to show stats for

Tags

List Tags

GET /mailgun/v3/{domain_name}/tags

Get Tag

GET /mailgun/v3/{domain_name}/tags/{tag_name}

Delete Tag

DELETE /mailgun/v3/{domain_name}/tags/{tag_name}

IPs

List IPs

GET /mailgun/v3/ips

Get IP

GET /mailgun/v3/ips/{ip_address}

Domain Tracking

Get Tracking Settings

GET /mailgun/v3/domains/{domain_name}/tracking

Update Open Tracking

PUT /mailgun/v3/domains/{domain_name}/tracking/open
Content-Type: application/x-www-form-urlencoded

active=yes

Update Click Tracking

PUT /mailgun/v3/domains/{domain_name}/tracking/click
Content-Type: application/x-www-form-urlencoded

active=yes

Update Unsubscribe Tracking

PUT /mailgun/v3/domains/{domain_name}/tracking/unsubscribe
Content-Type: application/x-www-form-urlencoded

active=yes&html_footer=<a href="%unsubscribe_url%">Unsubscribe</a>

Credentials

List Credentials

GET /mailgun/v3/domains/{domain_name}/credentials

Create Credential

POST /mailgun/v3/domains/{domain_name}/credentials
Content-Type: application/x-www-form-urlencoded

login=alice&password=supersecret

Delete Credential

DELETE /mailgun/v3/domains/{domain_name}/credentials/{login}

Pagination

Mailgun uses cursor-based pagination:

{
  "items": [...],
  "paging": {
    "first": "https://api.mailgun.net/v3/.../pages?page=first&limit=100",
    "last": "https://api.mailgun.net/v3/.../pages?page=last&limit=100",
    "next": "https://api.mailgun.net/v3/.../pages?page=next&limit=100",
    "previous": "https://api.mailgun.net/v3/.../pages?page=prev&limit=100"
  }
}

Use limit parameter to control page size (default: 100).

Code Examples

JavaScript - Send Email

const formData = new URLSearchParams();
formData.append('from', 'sender@example.com');
formData.append('to', 'recipient@example.com');
formData.append('subject', 'Hello');
formData.append('text', 'Hello World!');

const response = await fetch(
  'https://gateway.maton.ai/mailgun/v3/example.com/messages',
  {
    method: 'POST',
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`,
      'Content-Type': 'application/x-www-form-urlencoded'
    },
    body: formData.toString()
  }
);
const result = await response.json();
console.log(result);

Python - Send Email

import os
import requests

response = requests.post(
    'https://gateway.maton.ai/mailgun/v3/example.com/messages',
    headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'},
    data={
        'from': 'sender@example.com',
        'to': 'recipient@example.com',
        'subject': 'Hello',
        'text': 'Hello World!'
    }
)
print(response.json())

Python - List Domains

import os
import requests

response = requests.get(
    'https://gateway.maton.ai/mailgun/v3/domains',
    headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'}
)
domains = response.json()
for domain in domains['items']:
    print(f"{domain['name']}: {domain['state']}")

Python - Create Route and Webhook

import os
import requests

headers = {'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'}
domain = 'example.com'

# Create route
route_response = requests.post(
    'https://gateway.maton.ai/mailgun/v3/routes',
    headers=headers,
    data={
        'priority': 0,
        'description': 'Forward to webhook',
        'expression': 'match_recipient("support@example.com")',
        'action': 'forward("https://myapp.com/incoming-email")'
    }
)
print(f"Route created: {route_response.json()}")

# Create webhook
webhook_response = requests.post(
    f'https://gateway.maton.ai/mailgun/v3/domains/{domain}/webhooks',
    headers=headers,
    data={
        'id': 'delivered',
        'url': 'https://myapp.com/webhook/delivered'
    }
)
print(f"Webhook created: {webhook_response.json()}")

Notes

• Mailgun uses application/x-www-form-urlencoded for POST/PUT requests, not JSON
• Domain names must be included in most endpoint paths
• Routes are global (per account), not per domain
• Sandbox domains require authorized recipients for sending
• Dates are returned in RFC 2822 format
• Event logs are stored for at least 3 days
• Stats require at least one event parameter
• Templates use Handlebars syntax by default
• IMPORTANT: When using curl commands, use curl -g when URLs contain brackets to disable glob parsing
• IMPORTANT: When piping curl output to jq, environment variables may not expand correctly. Use Python examples instead.

Rate Limits

When rate limited, implement exponential backoff for retries.

Error Handling

Troubleshooting: API Key Issues

1. Check that the MATON_API_KEY environment variable is set:

echo $MATON_API_KEY

2. Verify the API key is valid by listing connections:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Troubleshooting: Invalid App Name

1. Ensure your URL path starts with mailgun. For example:

• Correct: https://gateway.maton.ai/mailgun/v3/domains
• Incorrect: https://gateway.maton.ai/v3/domains

Troubleshooting: Sandbox Domain Restrictions

Sandbox domains can only send to authorized recipients. To send emails:

1. Upgrade to a paid plan, or
2. Add recipient addresses to authorized recipients in the Mailgun dashboard

Resources

• Mailgun API Documentation
• Mailgun API Reference
• Mailgun Postman Collection
• Maton Community
• Maton Support