mail = options =>
  new Promise((resolve, reject) => {
    let o = {
      from: `Instagram <${MAIL}>`,
      ...options,
    }

    transporter.sendMail(o, err => {
      err ? reject(err) : resolve('Mail Sent!!')
    })
  })
Mails to specified eMail address
@param {Object} options
@param {String} options.to
@param {String} options.subject
@param {String} options.html
@returns {<Promise>} Promise