MailGun

mailgun.js

const request = require('request');

module.exports = (MAILGUN_API_KEY, MAILGUN_API_URL) => ({
  send({ from, to, subject, text, html, template, variables }) {
    return new Promise((resolve, reject) => {
      request.post(`${MAILGUN_API_URL}/messages`, {
        auth: {
          user: 'api',
          pass: MAILGUN_API_KEY
        },
        form: {
          from,
          to,
          subject,
          text,
          html,
          template,
          'h:X-Mailgun-Variables': JSON.stringify(variables)
        }
    }, (error, response, body) => {
        if (error) {
          reject(error);
        } else if (response.statusCode !== 200) {
          reject(new Error(response.statusMessage));
        } else {
          try {
            resolve(JSON.parse(body));
          } catch (error) {
            reject(error);
          }
        }
      });
    });
  }
});