How to get delivery status notification in phpmailer

require_once(APPPATH . '../third_party/PHPMailer/src/PHPMailer.php');
			require_once(APPPATH . '../third_party/PHPMailer/src/SMTP.php');
			require_once(APPPATH . '../third_party/PHPMailer/src/Exception.php');

			// Load Composer's autoloader
			require 'application/helpers/vendor/autoload.php';
			// Instantiation and passing `true` enables exceptions
			$mail = new PHPMailer(true);

			try {
				//Server settings
				$mail->SMTPDebug = SMTP::DEBUG_SERVER;                      // Enable verbose debug output
				$mail->isSMTP();                                            // Send using SMTP
				$mail->Host       = 'smtp.office365.com';                   // Set the SMTP server to send through
				$mail->SMTPAuth   =  true;                                   // Enable SMTP authentication
				$mail->Username   = 'xxxx.in';                     // SMTP username
				$mail->Password   = 'xxxx';                               // SMTP password
				$mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;         // Enable TLS encryption; `PHPMailer::ENCRYPTION_SMTPS` also accepted
				$mail->Port       = 587;    
				// $mail->SMTPDebug  = 1; 
				//Recipients
				$mail->setFrom('xxxx.in', 'Mailer');
				$mail->addAddress($data['mail'], 'Deepak Agarwal');     // Add a recipient
				// Attachments
				if($data['path'] != "" && $data['file'] != "")
				{
					$mail->addAttachment($data['path'],$data['file']);   
				}
				// $mail->addAttachment('2.png');         // Add attachments
				// $mail->addAttachment('3.png');         // Add attachments
				//$mail->addAttachment('1.png', 'Certificate Logo.png');    // Optional name

				// Content
				$mail->isHTML(true);                                  // Set email format to HTML
				$mail->Subject = $data['subject'];
				$mail->Body    = $data['message'];
				$mail->AltBody = $data['message'];
				if(!$mail->send())
				{
					// $this->CI->session->set_flashdata('msg', 'Message has not  sent successfully.');
					echo $mail->ErrorInfo;
					echo "Not send";
					$this->CI->session->set_flashdata('msg',$mail->getMessage());
					
					
				}else if(!$mail->ValidateAddress($data['mail'])){
					$this->CI->session->set_flashdata('errmail','Mail Not Send..!');
				}
				else{
					$this->CI->session->set_flashdata('msg', 'Message has been sent successfully.');
				
				}
				
			} 
			catch (phpmailerException  $e) {
				$this->CI->session->set_flashdata('errmail', $e->errorMessage()); //Pretty error messages from PHPMailer
				echo $e->errorMessage();
			}
			catch (Exception $e) {
				$this->CI->session->set_flashdata('errmail', $e->getMessage()); //Boring error messages from anything else!
				echo $e->getMessage();
			}