Android приложение перестало отправлять почту

Пару дней назад прекрасно отправляло электронную почту через smtp, а сейчас отказывается и выдает ошибку:

    javax.mail.AuthenticationFailedException

почту отправляю на yandex

Вот код класса отправки письма:

public class GMail {

final String emailPort = "587";// gmail's smtp port
final String smtpAuth = "true";
final String starttls = "true";
final String emailHost = "smtp.yandex.ru";


String fromEmail;
String fromPassword;
List<String> toEmailList;
String emailSubject;
String emailBody;

Properties emailProperties;
Session mailSession;
MimeMessage emailMessage;

public GMail() {

}

public GMail(String fromEmail, String fromPassword,
             List<String> toEmailList, String emailSubject, String emailBody) {
    this.fromEmail = fromEmail;
    this.fromPassword = fromPassword;
    this.toEmailList = toEmailList;
    this.emailSubject = emailSubject;
    this.emailBody = emailBody;

    emailProperties = System.getProperties();
    emailProperties.put("mail.smtp.port", emailPort);
    emailProperties.put("mail.smtp.auth", smtpAuth);
    emailProperties.put("mail.smtp.starttls.enable", starttls);
    Log.i("GMail", "Mail server properties set.");
}

public MimeMessage createEmailMessage() throws AddressException,
        MessagingException, UnsupportedEncodingException {

    mailSession = Session.getDefaultInstance(emailProperties, null);
    emailMessage = new MimeMessage(mailSession);

    emailMessage.setFrom(new InternetAddress());
    for (String toEmail : toEmailList) {
        Log.i("GMail", "toEmail: " + toEmail);
        emailMessage.addRecipient(Message.RecipientType.TO,
                new InternetAddress(toEmail));
    }

    emailMessage.setSubject(emailSubject);
    //emailMessage.setContent(emailBody, "text/html");// for a html email
     emailMessage.setText(emailBody);// for a text email
    Log.i("GMail", "Email Message created.");
    return emailMessage;
}

public void sendEmail() throws AddressException, MessagingException {

    Transport transport = mailSession.getTransport("smtp");
    transport.connect(emailHost, fromEmail, fromPassword);
    Log.i("GMail", "allrecipients: " + emailMessage.getAllRecipients());
    transport.sendMessage(emailMessage, emailMessage.getAllRecipients());
    transport.close();
    Log.i("GMail", "Email sent successfully.");
}

}