Javamail Read Body of Message Until EOF - email

Question

The following code is supposed to send and save messages sent via yahoomail. The sending part works OK but id does not save the sent message. I've been researching and found the following code:
/**
* Read the body of the message until EOF.
*/
public static String collect(BufferedReader in) throws IOException {
String line;
StringBuffer sb = new StringBuffer();
while ((line = in.readLine()) != null) {
sb.append(line);
sb.append("\n");
}
return sb.toString();
}
How do I incorporate it in the following code?
public void doSendYahooMail(){
from = txtFrom.getText();
password= new String(txtPassword.getPassword());
to = txtTo.getText();
cc = txtCC.getText();
bcc = txtBCC.getText();
subject = txtSubject.getText();
message_body = jtaMessage.getText();
//String imapHost = "imap.mail.yahoo.com";
Properties props = new Properties();
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.host", "smtp.mail.yahoo.com");
props.put("mail.smtp.port", "465");
props.put("mail.smtp.ssl.enable", "true");
props.put("mail.imap.host", "imap.mail.yahoo.com");
props.put("mail.imap.ssl.enable", "true");
props.put("mail.imap.port", "993");
Session session = Session.getInstance(props,null);
try {
// message definition
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.setRecipients(Message.RecipientType.TO,InternetAddress.parse(to));
if(!cc.equals("")){
message.setRecipients(Message.RecipientType.CC, InternetAddress.parse(cc));
}
if(!bcc.equals("")){
message.setRecipients(Message.RecipientType.BCC, InternetAddress.parse(bcc));
}
message.setSubject(subject);
if(!filename.equals("")){// if a file has been attached...
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText(message_body);// actual message
Multipart multipart = new MimeMultipart();// create multipart message
// set the text message part
multipart.addBodyPart(messageBodyPart);//add the text message to the multipart
// attachment part
messageBodyPart = new MimeBodyPart();
String attachment = fileAbsolutePath;
DataSource source = new FileDataSource(attachment);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
multipart.addBodyPart(messageBodyPart);//add the attachment to the multipart message
// combine text and attachment
message.setContent(multipart);
// send the complete message
Transport.send(message, from, password);
}
else{// if no file has been attached
message.setText(message_body);
Transport.send(message, from, password);
}
JOptionPane.showMessageDialog(this, "Message Sent!","Sent",JOptionPane.INFORMATION_MESSAGE);
filename = "";//reset filename to null after message is sent
fileAbsolutePath = "";//reset absolute path name to null after message is sent
// save sent message
Store store = session.getStore("imap");
store.connect(from, password);
Folder folder = store.getFolder("Sent");
if(!folder.exists()){
folder.create(Folder.HOLDS_MESSAGES);
Message[] msg = new Message[1];
msg[0] = message;
folder.appendMessages(msg);
}
store.close();
} catch (Exception e) {
JOptionPane.showMessageDialog(this, e.toString());
}
}