const { EmailApi, EmailMessage } = require('sendpost_js');
const email = new EmailApi();
const apiKey = 'your_api_key'; // {String} Sub-Account API Key

(async function() {
  const message = new EmailMessage();
  message.from = { email: '[email protected]' };
  message.to = [{ email: '[email protected]' }]
  message.subject = 'Hello'
  message.htmlBody = '<strong>it works!</strong>';
  message.ippool = 'PiedPiper'

  const opts = {
    emailMessage: message
  };
  try {
    const data = await email.sendEmail(apiKey, opts)
    console.log('API called successfully. Returned data: ', data);
  } catch (error) {
    console.error(error);
  }
})()

[
  {
    "to": "<string>",
    "submittedAt": 123,
    "messageId": "<string>",
    "errorCode": 123,
    "message": "<string>"
  }
]