title: Automatically Mail send in Background in Android
body: <p>When I press on Send Button  in log show Mail Sent But Actually  mail not sent. Please help me my code below. 
  Why Mail not sent?</p>
  
  <p><strong>GMailSender.java</strong></p>
  
  <pre><code>package com.example.sendmail;
  
  import javax.activation.DataHandler;
  import javax.activation.DataSource;
  import javax.activation.FileDataSource;
  import javax.mail.BodyPart;
  import javax.mail.Message;
  import javax.mail.Multipart;
  import javax.mail.PasswordAuthentication;
  import javax.mail.Session;
  import javax.mail.Transport;
  import javax.mail.internet.InternetAddress;
  import javax.mail.internet.MimeBodyPart;
  import javax.mail.internet.MimeMessage;
  import javax.mail.internet.MimeMultipart;
  
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.security.Security;
  import java.util.Properties;
  
  public class GMailSender extends javax.mail.Authenticator {
      private String mailhost = "smtp.gmail.com";
      private String user;
      private String password;
      private Session session;
  
      private Multipart _multipart = new MimeMultipart();
      static {
          Security.addProvider(new com.example.sendmail.JSSEProvider());
      }
  
      public GMailSender(String user, String password) {
          this.user = user;
          this.password = password;
  
          Properties props = new Properties();
          props.setProperty("mail.transport.protocol", "smtp");
          props.setProperty("mail.host", mailhost);
          props.put("mail.smtp.auth", "true");
          props.put("mail.smtp.port", "465");
          props.put("mail.smtp.socketFactory.port", "465");
          props.put("mail.smtp.socketFactory.class",
                  "javax.net.ssl.SSLSocketFactory");
          props.put("mail.smtp.socketFactory.fallback", "false");
          props.setProperty("mail.smtp.quitwait", "false");
  
          session = Session.getDefaultInstance(props, this);
      }
  
      protected PasswordAuthentication getPasswordAuthentication() {
          return new PasswordAuthentication(user, password);
      }
  
      public synchronized void sendMail(String subject, String body,
              String sender, String recipients) throws Exception {
          try {
              MimeMessage message = new MimeMessage(session);
              DataHandler handler = new DataHandler(new ByteArrayDataSource(
                      body.getBytes(), "text/plain"));
              message.setSender(new InternetAddress(sender));
              message.setSubject(subject);
              message.setDataHandler(handler);
              BodyPart messageBodyPart = new MimeBodyPart();
              messageBodyPart.setText(body);
              _multipart.addBodyPart(messageBodyPart);
  
              // Put parts in message
              message.setContent(_multipart);
              if (recipients.indexOf(',') &gt; 0)
                  message.setRecipients(Message.RecipientType.TO,
                          InternetAddress.parse(recipients));
              else
                  message.setRecipient(Message.RecipientType.TO,
                          new InternetAddress(recipients));
              Transport.send(message);
          } catch (Exception e) {
  
          }
      }
  
      public void addAttachment(String filename) throws Exception {
          BodyPart messageBodyPart = new MimeBodyPart();
          DataSource source = new FileDataSource(filename);
          messageBodyPart.setDataHandler(new DataHandler(source));
          messageBodyPart.setFileName("download image");
  
          _multipart.addBodyPart(messageBodyPart);
      }
  
      public class ByteArrayDataSource implements DataSource {
          private byte[] data;
          private String type;
  
  
          public ByteArrayDataSource(byte[] data, String type) {
              super();
              this.data = data;
              this.type = type;
          }
  
          public ByteArrayDataSource(byte[] data) {
              super();
              this.data = data;
          }
  
  
          public void setType(String type) {
              this.type = type;
          }
  
          public String getContentType() {
              if (type == null)
                  return "application/octet-stream";
              else
                  return type;
          }
  
          public InputStream getInputStream() throws IOException {
              return new ByteArrayInputStream(data);
          }
  
          public String getName() {
              return "ByteArrayDataSource";
          }
  
          public OutputStream getOutputStream() throws IOException {
              throw new IOException("Not Supported");
          }
      }
  }
  </code></pre>
  
  <p><strong>JSSEProvider.java</strong></p>
  
  <pre><code>package com.example.sendmail;
  
  import java.security.AccessController;
  import java.security.Provider;
  
  public final class JSSEProvider extends Provider {
  
      public JSSEProvider() {
          super("HarmonyJSSE", 1.0, "Harmony JSSE Provider");
          AccessController
                  .doPrivileged(new java.security.PrivilegedAction&lt;Void&gt;() {
                      public Void run() {
                          put("SSLContext.TLS",
                                  "org.apache.harmony.xnet.provider.jsse.SSLContextImpl");
                          put("Alg.Alias.SSLContext.TLSv1", "TLS");
                          put("KeyManagerFactory.X509",
                                  "org.apache.harmony.xnet.provider.jsse.KeyManagerFactoryImpl");
                          put("TrustManagerFactory.X509",
                                  "org.apache.harmony.xnet.provider.jsse.TrustManagerFactoryImpl");
                          return null;
                      }
                  });
      }
  }
  </code></pre>
  
  <p><strong>MainActivity.java</strong></p>
  
  <pre><code>package com.example.sendmail;
  
  import android.os.Bundle;
  import android.os.Environment;
  import android.annotation.SuppressLint;
  import android.app.Activity;
  import android.util.Log;
  import android.view.Menu;
  import android.view.View;
  import android.widget.Button;
  import android.widget.Toast;
  
   public class MainActivity extends Activity {
      Button send;
  //String filename = "/sdcard/mysdfile";
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
  
          send = (Button) findViewById(R.id.send);
          send.setOnClickListener(new View.OnClickListener() {
  
              public void onClick(View v) {
                  // TODO Auto-generated method stub
                  new Thread(new Runnable() {
                      @SuppressLint("SdCardPath") public void run() {
                          try {
                              GMailSender sender = new GMailSender("sendermail@gmail.com","**password***");
                              ///Toast.makeText(getApplicationContext(), "Connect", Toast.LENGTH_LONG).show();
                              //sender.addAttachment(filename);
                              sender.addAttachment(Environment.getExternalStorageDirectory().getPath()+"/sdcard/mysdfile.txt");
                              sender.sendMail("Test mail", "This mail has been sent from android app along with attachment","sendermail@gmail.com",
                                      "recievermail@yahoo.com");
  
                              Log.i("Mail", "Sent");
                              //Toast.makeText(getApplicationContext(),"Your mail has been sent",Toast.LENGTH_LONG).show();
  
  
                          } catch (Exception e) {
                              runOnUiThread(new Runnable() 
                              {
                                  public void run() 
                                  {
                                      Toast.makeText(getApplicationContext(), "Error", Toast.LENGTH_SHORT).show();    
                                  }
                              }); 
  
                              Log.i("Mail", "Failed"+e);
                              //Toast.makeText(getApplicationContext(),"Error",Toast.LENGTH_LONG).show();
  
                          }
                      }
                  }).start();
  
                  send.setText("Ok");
              }
          });
  
      }
  
  }
  </code></pre>
  
  <p>no error appear and not send mail in sender mail and no mail in receiver mail inbox.</p>