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The Paubox MCP Server exposes five tools. Each tool maps to an underlying Paubox API operation and is available to any connected MCP client.

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send_secure_email

Sends a single HIPAA compliant email through the Paubox Email API. The sender address must belong to a domain you have verified in the Paubox dashboard.
ParameterTypeRequiredDescription
fromstringYesSender address. Must be on a verified Paubox domain.
toarray of stringsYesRecipient email addresses.
subjectstringYesEmail subject line.
messagestringYesMessage body. Sent as plain text; the server also generates an HTML version automatically.
ccarray of stringsNoCC recipients.
bccarray of stringsNoBCC recipients.
forceSecureNotificationbooleanNoForce a secure notification regardless of recipient settings. Defaults to false.
apiKeystringNoPaubox API key. HTTP transport only; overrides the credential resolved from the connector or headers.
apiUserstringNoPaubox API user. HTTP transport only; overrides the credential resolved from the connector or headers.
Example payload 
{
  "from": "provider@clinic.com",
  "to": ["patient@example.com"],
  "subject": "Your appointment summary",
  "message": "Thank you for visiting us today."
}
Response: returns a sourceTrackingId string you can pass to check_email_status.

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check_email_status

Retrieves the current delivery status of a message sent via send_secure_email.
ParameterTypeRequiredDescription
sourceTrackingIdstringYesThe tracking ID returned by send_secure_email.
apiKeystringNoPaubox API key. HTTP transport only.
apiUserstringNoPaubox API user. HTTP transport only.
Example payload 
{
  "sourceTrackingId": "abc123def456"
}
Response: returns an object with delivery disposition details and a timestamp.

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validate_credentials

Verifies that the Paubox API credentials are present and valid by making a live check against the Paubox API. Useful as a first step before sending email.
ParameterTypeRequiredDescription
apiKeystringNoPaubox API key. HTTP transport only; pass if you want to validate specific credentials rather than the ones already configured.
apiUserstringNoPaubox API user. HTTP transport only.
When connecting via stdio (Claude Code), credentials come from environment variables and no parameters are needed. Example payload 
{}
Response: returns a confirmation with the API user and a masked API key on success, or an error description if the credentials are missing or invalid.

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get_form

Available via HTTP transport only. Not available when using the stdio transport (Claude Code).
Retrieves the full definition of a Paubox Form, including its title, description, and field schema, so an agent can present the form questions in a conversation. No authentication is required for this tool.
ParameterTypeRequiredDescription
formIdstring (UUID)YesUUID of the Paubox Form to retrieve.
Example payload 
{
  "formId": "550e8400-e29b-41d4-a716-446655440000"
}
Response: returns a form object including title, description, form_json (field definitions), and metadata fields (active, signable, submission_count, created_at, updated_at).

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submit_form

Available via HTTP transport only. Not available when using the stdio transport (Claude Code).
Submits a completed response to a Paubox Form. No authentication is required for this tool.
ParameterTypeRequiredDescription
formIdstring (UUID)YesUUID of the form being submitted.
formDataobjectYesKey-value pairs matching the form’s field schema (form_json). Structure varies per form.
attachmentsarray of objectsNoFile attachments. Each object must include name (filename) and content (base64-encoded file). Max total size: 250 MB.
Example payload: text fields only 
{
  "formId": "550e8400-e29b-41d4-a716-446655440000",
  "formData": {
    "first_name": "Jane",
    "last_name": "Smith",
    "email": "jane@example.com"
  }
}
Example payload: with attachment 
{
  "formId": "550e8400-e29b-41d4-a716-446655440000",
  "formData": {
    "first_name": "Jane"
  },
  "attachments": [
    {
      "name": "consent.pdf",
      "content": "JVBERi0xLjQ..."
    }
  ]
}
Response: returns a success confirmation message on success.