Отправка электронной почты из приложения (без почтового клиента)

package com.example.myapplication;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
 
import java.util.Properties;
 
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
 
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
 
    //Declaring EditText
    private EditText editTextEmail;
    private EditText editTextSubject;
    private EditText editTextMessage;
 
    //Send button
    private Button buttonSend;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        //Initializing the views
        editTextEmail = (EditText) findViewById(R.id.editTextEmail);
        editTextSubject = (EditText) findViewById(R.id.editTextSubject);
        editTextMessage = (EditText) findViewById(R.id.editTextMessage);
 
        buttonSend = (Button) findViewById(R.id.buttonSend);
 
        //Adding click listener
        buttonSend.setOnClickListener(this);
    }
 
 
    private void sendEmail() {
        //Getting content for email
        String email = editTextEmail.getText().toString().trim();
        String subject = editTextSubject.getText().toString().trim();
        String message = editTextMessage.getText().toString().trim();
 
        //Creating SendMail object
        SendMail sm = new SendMail(this, email, subject, message);
 
        //Executing sendmail to send email
        sm.execute();
    }
 
    @Override
    public void onClick(View v) {
        sendEmail();
    }
}

package com.example.myapplication;
 
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.widget.Toast;
 
import java.util.Properties;
 
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
 
/**
 * Created by Belal on 10/30/2015.
 */
 
//Class is extending AsyncTask because this class is going to perform a networking operation
public class SendMail extends AsyncTask<Void,Void,Void> {
 
    //Declaring Variables
    private Context context;
    private Session session;
 
    //Information to send email
    private String email;
    private String subject;
    private String message;
 
    //Progressdialog to show while sending email
    private ProgressDialog progressDialog;
 
    //Class Constructor
    public SendMail(Context context, String email, String subject, String message){
        //Initializing variables
        this.context = context;
        this.email = email;
        this.subject = subject;
        this.message = message;
    }
 
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        //Showing progress dialog while sending email
        progressDialog = ProgressDialog.show(context,"Sending message","Please wait...",false,false);
    }
 
    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        //Dismissing the progress dialog
        progressDialog.dismiss();
        //Showing a success message
        Toast.makeText(context,"Message Sent",Toast.LENGTH_LONG).show();
    }
 
    @Override
    protected Void doInBackground(Void... params) {
        //Creating properties
        Properties props = new Properties();
 
 
//Протоколы для mail
        props.put("mail.transport.protocol", "smtp");
        props.put("mail.smtp.host", "smtp.mail.ru");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.debug", "true");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", 2525);
 
 
 
        //Creating a new session
        session = Session.getDefaultInstance(props,
                new javax.mail.Authenticator() {
                    //Authenticating the password
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(Config.EMAIL, Config.PASSWORD);
                    }
                });
 
        try {
            //Creating MimeMessage object
            MimeMessage mm = new MimeMessage(session);
 
            //Setting sender address
            mm.setFrom(new InternetAddress(Config.EMAIL));
            //Adding receiver
            mm.addRecipient(Message.RecipientType.TO, new InternetAddress(email));
            //Adding subject
            mm.setSubject(subject);
            //Adding message
            mm.setText(message);
 
            //Sending email
            Transport.send(mm);
 
        } catch (MessagingException e) {
            e.printStackTrace();
        }
        return null;
    }
}

package com.example.myapplication;
 
public class Config
{
    public static final String EMAIL ="Вписываем почту с которой отправляем сообщение";
    public static final String PASSWORD ="пороль от почты";
}

        props.put("mail.transport.protocol", "smtp");
        props.put("mail.smtp.host", "smtp.yandex.ru");
        props.put("mail.smtp.starttls.enable", "true");
        props.put("mail.debug", "true");
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.port", "465");