$mail->isSMTP();                                      // Set mailer to use SMTP
          $mail->Host = 'smtp.web-co.cz';                       // Specify main and backup SMTP servers
          $mail->SMTPAuth = true;                               // Enable SMTP authentication
          $mail->Username = 'robot@web-co.cz';                  // SMTP username
          $mail->Password = '################';                 // SMTP password
          $mail->SMTPSecure = 'tls';                            // Enable TLS encryption, `ssl` also accepted
          $mail->Port = 587;                                    // TCP port to connect to