How to read OTP from Email using Selenium WebDriver?

The code below can be used to fetch OTP from Outlook mail box, similar smtp can be used for the all other mail boxes.

public static String OutlookMailReader(String mailFolderName,String emailSubjectContent, String emailContent, int lengthOfOTP) {

            
//mailFolderName(Eg- "INBOX"), emailSubjectContent(Eg- Mail for OTP),
emailContent(Eg- OTP is 111111), OTP length(Eg- 6)
            String hostName = "smtp-mail.outlook.com";//change it according to your mail

            String username = "****@***.com";//username 

            String password = "*******";

            int messageCount;

            int unreadMsgCount;

            String emailSubject;

            Message emailMessage;

            String searchText=null ;

            Properties sysProps = System.getProperties();

            sysProps.setProperty("mail.store.protocol", "imaps");

            try {

                Session session = Session.getInstance(sysProps, null);

                Store store = session.getStore();

                store.connect(hostName, username, password);

                Folder emailBox = store.getFolder(mailFolderName);

                emailBox.open(Folder.READ_WRITE);

                messageCount = emailBox.getMessageCount();

                System.out.println("Total Message Count: " + messageCount);

                unreadMsgCount = emailBox.getNewMessageCount();

                System.out.println("Unread Emails count:" + unreadMsgCount);

                for(int i=messageCount; i>(messageCount-unreadMsgCount); i--)

                {

                    emailMessage = emailBox.getMessage(i);

                    emailSubject = emailMessage.getSubject();

                    if(emailSubject.contains(emailSubjectContent))

                    {

                        System.out.println("OTP mail found");

                        String line;

                        StringBuffer buffer = new StringBuffer();

                        BufferedReader reader = new BufferedReader(new InputStreamReader(emailMessage.getInputStream()));

                        while ((line = reader.readLine()) != null) {

                            buffer.append(line);

                        }

                        String messageContent=emailContent;

                        String result = buffer.toString().substring(buffer.toString().indexOf(messageContent));

                        searchText = result.substring(messageContent.length(), messageContent.length()+lengthOfOTP);

                        System.out.println("Text found : "+ searchText);

                        emailMessage.setFlag(Flags.Flag.SEEN, true);

                        break;

                    }

                    emailMessage.setFlag(Flags.Flag.SEEN, true);

                }

                emailBox.close(true);

                store.close();


            } catch (Exception mex) {

                mex.printStackTrace();

                System.out.println("OTP Not found ");

            }

            return searchText;

        }

Explaination: mailFolderName(Eg- "INBOX"), emailSubjectContent(Eg- Mail for OTP), emailContent(Eg- OTP is 111111), OTP length(Eg- 6) as my activation code is 6 digits.

The code checks for outlook mail and checks for the recent unread mail for mail with subject(Eg : OTP mail). Opens the selected mail and returns the OTP