How To Check Mail Validation in Selenium WebDriver?

Here is the working solution for your problem. It uses JAVAX MAIL API and JAVA code.It does a lot more, so remove the code that u don't need.

  public GmailUtils(String username, String password, String server, EmailFolder     emailFolder) throws Exception {    Properties props = System.getProperties();    props.setProperty("mail.store.protocol", "imap");    props.setProperty("mail.imaps.partialfetch", "false");    props.put("mail.imap.ssl.enable", "true");    props.put("mail.mime.base64.ignoreerrors", "true");    Session session = Session.getDefaultInstance(props, null);    Store store = session.getStore("imap");    store.connect("imap.gmail.com", 993, "<your email>", "<your password>");    Folder folder = store.getFolder(emailFolder.getText());    folder.open(Folder.READ_WRITE);    System.out.println("Total Messages:" + folder.getMessageCount());    System.out.println("Unread Messages:" + folder.getUnreadMessageCount());    messages = folder.getMessages();    for (Message mail : messages) {        if (!mail.isSet(Flags.Flag.SEEN)) {            System.out.println("***************************************************");            System.out.println("MESSAGE : \n");            System.out.println("Subject: " + mail.getSubject());            System.out.println("From: " + mail.getFrom()[0]);            System.out.println("To: " + mail.getAllRecipients()[0]);            System.out.println("Date: " + mail.getReceivedDate());            System.out.println("Size: " + mail.getSize());            System.out.println("Flags: " + mail.getFlags());            System.out.println("ContentType: " + mail.getContentType());                            System.out.println("Body: \n" + getEmailBody(mail));            System.out.println("Has Attachments: " + hasAttachments(mail));        }    }}public boolean hasAttachments(Message email) throws Exception {    // suppose 'message' is an object of type Message    String contentType = email.getContentType();    System.out.println(contentType);    if (contentType.toLowerCase().contains("multipart/mixed")) {        // this message must contain attachment        Multipart multiPart = (Multipart) email.getContent();        for (int i = 0; i < multiPart.getCount(); i++) {            MimeBodyPart part = (MimeBodyPart) multiPart.getBodyPart(i);            if (Part.ATTACHMENT.equalsIgnoreCase(part.getDisposition())) {                System.out.println("Attached filename is:" + part.getFileName());                MimeBodyPart mimeBodyPart = (MimeBodyPart) part;                String fileName = mimeBodyPart.getFileName();                String destFilePath = System.getProperty("user.dir") + "\\Resources\\";                File fileToSave = new File(fileName);                mimeBodyPart.saveFile(destFilePath + fileToSave);                // download the pdf file in the resource folder to be read by PDFUTIL api.                PDFUtil pdfUtil = new PDFUtil();                String pdfContent = pdfUtil.getText(destFilePath + fileToSave);                System.out.println("******---------------********");                System.out.println("\n");                System.out.println("Started reading the pdfContent of the attachment:==");                System.out.println(pdfContent);                System.out.println("\n");                System.out.println("******---------------********");                Path fileToDeletePath = Paths.get(destFilePath + fileToSave);                Files.delete(fileToDeletePath);            }        }        return true;    }    return false;}public String getEmailBody(Message email) throws IOException, MessagingException {    String line, emailContentEncoded;    StringBuffer bufferEmailContentEncoded = new StringBuffer();    BufferedReader reader = new BufferedReader(new InputStreamReader(email.getInputStream()));    while ((line = reader.readLine()) != null) {        bufferEmailContentEncoded.append(line);    }    System.out.println("**************************************************");    System.out.println(bufferEmailContentEncoded);    System.out.println("**************************************************");    emailContentEncoded = bufferEmailContentEncoded.toString();    if (email.getContentType().toLowerCase().contains("multipart/related")) {        emailContentEncoded = emailContentEncoded.substring(emailContentEncoded.indexOf("base64") + 6);        emailContentEncoded = emailContentEncoded.substring(0, emailContentEncoded.indexOf("Content-Type") - 1);        System.out.println(emailContentEncoded);        String emailContentDecoded = new String(new Base64().decode(emailContentEncoded.toString().getBytes()));        return emailContentDecoded;    }    return emailContentEncoded;}

I would suggest you to use Nada email api which are disposable email addresses and very easy to get the content.

Check the examples here.

http://www.testautomationguru.com/selenium-webdriver-email-validation-with-disposable-email-addresses/