Mailtarget Email

Send emails and manage email infrastructure via the Mailtarget API.

Setup

Set the MAILTARGET_API_KEY environment variable with your Mailtarget API key.

Get your API key from the Mailtarget dashboard → Settings → API Keys.

Sending Email

Use curl or any HTTP client. All requests go to https://transmission.mailtarget.co/v1 with Authorization: Bearer $MAILTARGET_API_KEY.

Simple send

curl -X POST https://transmission.mailtarget.co/v1/layang/transmissions \
  -H "Authorization: Bearer $MAILTARGET_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "to": [{"email": "recipient@example.com", "name": "Recipient"}],
    "from": {"email": "noreply@yourdomain.com", "name": "Your App"},
    "subject": "Hello from Mailtarget",
    "bodyHtml": "<h1>Hello!</h1><p>This is a test email.</p>",
    "bodyText": "Hello! This is a test email."
  }'

A successful response returns {"message": "Transmission received", "transmissionId": "..."}.

Template-based send

Use templateId with substitutionData instead of bodyHtml/bodyText:

{
  "to": [{"email": "user@example.com", "name": "User"}],
  "from": {"email": "noreply@yourdomain.com", "name": "Your App"},
  "subject": "Welcome, {{name}}!",
  "templateId": "welcome-template",
  "substitutionData": {"name": "User", "company": "Acme"}
}

Tracking options

Control click and open tracking per transmission:

{
  "optionsAttributes": {
    "clickTracking": true,
    "openTracking": true,
    "transactional": true
  }
}

Set transactional: true for transactional emails (password resets, receipts) to bypass unsubscribe preferences.

Attachments

Include base64-encoded attachments:

{
  "attachments": [{
    "filename": "report.pdf",
    "mimeType": "application/pdf",
    "value": "<base64-encoded-content>"
  }]
}

Managing Templates

List: GET /template?page=1&size=10&search=keyword
Create: POST /template with {"id": "slug", "name": "Display Name", "html": "<html>..."}

Managing Sending Domains

List: GET /domain/sending
Create: POST /domain/sending with {"domain": "example.com"}
Verify: PUT /domain/sending/{id}/verify-txt
Check SPF: GET /domain/sending/{id}/spf-suggestion

Autonomous Domain Setup (with cloudflare-dns skill)

When paired with the cloudflare-dns skill, the agent can set up a sending domain end-to-end with zero manual DNS editing:

Create sending domain: POST /domain/sending with {"domain": "example.com"}
Read required DNS records from the response: spfHostname, spfValue, dkimHostname, dkimValue, cnameHostname, cnameValue
Add SPF TXT record in Cloudflare using spfHostname and spfValue
Add DKIM TXT record in Cloudflare using dkimHostname and dkimValue
Add CNAME record in Cloudflare using cnameHostname and cnameValue (set proxied: false)
Verify domain: PUT /domain/sending/{id}/verify-txt
Confirm status via GET /domain/sending/{id} — check spfVerified, dkimVerified, cnameVerified

Install the companion skill: clawhub install cloudflare-dns

Getting Started

New to Mailtarget + OpenClaw? See references/getting-started.md for a 5-minute setup guide.

Full API Reference

See references/api.md for complete endpoint documentation including API key management, sub-accounts, and permissions.