code: public function setMailBoxPassword($domainName, $mailBox, $password)
      {
          return $this->call(self::SERVICE, 'setMailBoxPassword', [$domainName, $mailBox, $password]);
      }
docs: Set a new password for a mail box from a web hosting package.
  
  @param string                         $domainName Domain name to set the mail box password for
  @param \TransIP\Model\MailBox $mailBox    Mail box to set the password for
  @param string                         $password   New password for the mail box
  
  @throws \SoapFault
  
  @return mixed