nodejs/node

Hi,i am trying to get only those emails which are received as email reply send by my system.for more specific i am sending email with attachment .and receiver replies to that email with attachment.

I want history of email in my system which shows which attachment is received against which email. for example if i have send email to pearson B.Pearson B will reply to that email.i want history of this.
I am able to send and receive email.But the issue is that i am getting all email fetched betwwen a and b(I want only those email which is send as reply of particular email).Below i gave given code to fetch email.

var mailListener = new MailListener({
              username: "******",
              password: "******",
              host: "imap-mail.outlook.com",
              port: 993, // imap port
              tls: true,
              connTimeout: 10000, // Default by node-imap
              authTimeout: 5000, // Default by node-imap,
              tlsOptions: { rejectUnauthorized: false },
              mailbox: "INBOX", // mailbox to monitor
              searchFilter: [ 'UNSEEN', ['FROM', req.params.email] ], // the search filter being used after an IDLE notification has been retrieved , 
              markSeen: false, // all fetched email willbe marked as seen and not fetched next time
              fetchUnreadOnStart: true, // use it only if you want to get all unread email on lib start. Default is `false`,
              mailParserOptions: {streamAttachments: true}, // options to be passed to mailParser lib.
              attachments: true, // download attachments as they are encountered to the project directory
              attachmentOptions: { directory: "attachments/" } // specify a download directory for attachments
        });

        mailListener.start();

        mailListener.on("server:connected", function(){
          console.log("imapConnected");
        });

        mailListener.on("error", function(err){
          console.log('hello');
        });

        mailListener.on("mail", function(mail, seqno, attributes){
            console.log(seqno)
            let attachments = [];
            var attachment = mail.attachments;
            if(attachment) {
                for(var i = 0, len = attachment.length; i < len; ++i){
                    attachments.push(attachment[i].fileName);
                }
            }
            passDatatoPage(mail, attachments);
            mailListener.stop();
        }) 

        mailListener.on("attachment", function(attachment){
            let filepath = './public/attachment/receive/';
            let output = fs.createWriteStream(filepath + attachment.fileName);
            attachment.stream.pipe(output).on("end", function () {
                console.log("All the data in the file has been read");
            }).on("close", function (err) {
                console.log("Stream has been cloesd.");
            });  
        });


        function passDatatoPage(mail, attachments) {
            var sender = mail.to[0].address;
            var senderName = mail.from[0].name;
            var reciver = mail.from[0].address;
            const date = moment(mail.date).format('LL');
            var subject = mail.subject;
            var message = mail.text;
            //console.log(attachments);
            var result = attachments.map(function(val) {
                return val;
            }).join(',');
            var attachmentArr = result.split(',');
            console.log(attachmentArr)
            res.render('email-reply', { title: 'Email Reply', to: sender, senderName: senderName, from: reciver, date: date, subject: subject, msg: message, attachments: attachmentArr});
        }

    });

May I know what is wrong with my code? please provide possible solution in this code or provide way how i achive my task. Thanks in advance.