What do i need to know to send email using Java???

hi there
what do i need to know to build an application that sends email? thank you.

It would also help if you knew something about how Internet e-mail works. Such as what an SMTP server does, what relaying is and why it's bad, and so on.

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How to send emails using java code

Hi,
can any give me some sample code for sending emails using java language

JavaMail quick start
jGuru: Fundamentals of the JavaMail API

Sending Email using java code

I am using the following code to send an email from my java servlet but the problem is, when it is on its own it works fine but as soon as I combine it with some code to submit data into a postgres database it sometimes does not perform could it be because im missing some close statements??
//grades to submit grades starts here
 String [] paramValues = req.getParameterValues("Mark");
 for(int i=0; i<paramValues.length;i++)
 String [] paramValues2 = req.getParameterValues("StudentExamNumber");
 String Mark = paramValues;
 String ExamNo = paramValues2[i];
 //testing purposes
 out.println("<tr><td>"+ExamNo+"</td>");
 out.println("<td>"+Mark+"</td>");
 try
 st = conn.createStatement();
 query = "SELECT StudentNo FROM STUDENTS"+WebCourse2+ " where ExamNo='"+ExamNo+"'";
 rs = st.executeQuery(query);
 if(rs !=null)
 while(rs.next())
 String StudentNo=rs.getString("StudentNo");
 //testing purposes
 //out.println("<td>"+StudentNo+"</td></tr>");
 here
 st4 = conn.createStatement();
 query4 = "select MAX(entryno) from STUDENTRESULTSFORCOURSE"+WebCourse2+" WHERE STUDENTNO='"+StudentNo+"'";
 rs4 = st4.executeQuery(query4);
 if(rs4 !=null)
 while(rs4.next())
 EntryNo = rs4.getInt(1);
 }//end rs4 while
 rs4.close();
 }//end rs4 if
 out.println("<tr><td>EntryNo= "+EntryNo+"</td>");
 EntryNo = EntryNo + 1;
 out.println("<td>NewEntryNo= "+EntryNo+"</td></tr>");
 //Submitting grades to database/
 st3 = conn.createStatement();
 insert = "insert into STUDENTRESULTSFORCOURSE"+WebCourse2+" (StudentNo, CourseCode, AttemptNo, ExamMark, EntryNo, EnteredBy) values ('"+StudentNo+"', '"+WebCourse2+"', 1,'"+Mark+"',"+EntryNo+",'"+WebUsername2+"')";
 st3.executeUpdate(insert);
 }//end rs while
 rs.close();
 }//end rs if
 }//end try
 catch (SQLException e)
 System.out.println("Error: "+e.getMessage());
 }//end for loop
 //code to submit grades ends here
 //code used to send email starts here
 String m_sHostName="localhost";
 int m_iPort=25;
 try
 // Open port to server
 smtpSocket = new Socket(m_sHostName, m_iPort);
 os = new DataOutputStream(smtpSocket.getOutputStream());
 is = new DataInputStream(smtpSocket.getInputStream());
 if(smtpSocket != null && os != null && is != null)
 // Connection was made. Socket is ready for use.
 System.out.println("Connection was made. Socket is ready for use.");
 try
 // The email address that the server
 // you are using know user as.
 os.writeBytes("MAIL From: <[email protected]>\r\n");
 // Who the email is going to.
 os.writeBytes("RCPT To: <[email protected]>\r\n");
 //send a CC to:
 os.writeBytes("RCPT Cc: <[email protected]>\r\n");
 // add the message and the
 // header of the email to be sent out.
 os.writeBytes("DATA\r\n");
 os.writeBytes("X-Mailer: Via Java\r\n");
 os.writeBytes("From: "+WebUsername2+"<[email protected]>\r\n");
 os.writeBytes("To: Marie <[email protected]>\r\n");
 //Again if you want to send a CC then add this.
 os.writeBytes("Cc: ProfCuthbert <[email protected]>\r\n");
 String sMessage = "ELECTRONIC ENGINEERING EXAM COLLATION SYSTEM EMAIL\n\nThe results for the following course have been submitted by the following member of staff\n\nCOURSE: "+WebCourse2+"\n\nSUBMITTED BY: "+WebUsername2+" \n\nPLEASE LOCK COURSE NOW IN ORDER TO PREVENT ANY FURTHER SUBMISSIONS TO BE MADE BY USERS.";
 os.writeBytes("Subject: A SUBMISSION HAS BEEN MADE FOR COURSE "+WebCourse2+"\r\n");
 os.writeBytes(sMessage + "\r\n");
 os.writeBytes("\r\n.\r\n");
 os.writeBytes("QUIT\r\n");
 // Now send the email off and check the server reply.
 // Once an OK is reached you are complete.
 String responseline;
 //for testing purposes
 //out.println(responseline = is.readLine());
 while((responseline = is.readLine())!=null)
 //for testing purposes
 //out.println("responseline= "+responseline+" ");
 //out.println("responseline.indexOf(Ok)= "+responseline.indexOf("Ok"));
 if(responseline.indexOf("Ok") != -1)
 break;
 if(responseline.indexOf("Ok") == -1)
 confirm=1;
 if (confirm==1)
 out.println(" the marks have been submitted thank you");
 catch(Exception e)
 { System.out.println("Cannot send email as an error occurred.");
 out.println("Cannot send email as an error occurred.");
 catch(Exception e)
 { System.out.println("Host " + m_sHostName + "unknown"); }
Does anyone know what the problem is??
thanks
tzaf

i close them later in the program. Ive made sure they are all closed I have a feeling that it could be coming from here....
//code used to send email starts here
 String m_sHostName="localhost";
 int m_iPort=25;
 try
 // Open port to server
 smtpSocket = new Socket(m_sHostName, m_iPort);
 os = new DataOutputStream(smtpSocket.getOutputStream());
 is = new DataInputStream(smtpSocket.getInputStream());
 if(smtpSocket != null && os != null && is != null)
 // Connection was made. Socket is ready for use.
 System.out.println("Connection was made. Socket is ready for use.");
 try
 // The email address that the server
 // you are using know user as.
 os.writeBytes("MAIL From: <email address>\r\n");
 // Who the email is going to.
 os.writeBytes("RCPT To: <email address>\r\n");
 //send a CC to:
 os.writeBytes("RCPT Cc: <email address>\r\n");
 // add the message and the
 // header of the email to be sent out.
 os.writeBytes("DATA\r\n");
 os.writeBytes("X-Mailer: Via Java\r\n");
 os.writeBytes("From: "+WebUsername2+"<email address>\r\n");
 os.writeBytes("To: hello<email address>\r\n");
 //Again if you want to send a CC then add this.
 os.writeBytes("Cc: hello <email address>\r\n");
 String sMessage = "ELECTRONIC ENGINEERING EXAM COLLATION SYSTEM EMAIL\n\nThe results for the following course have been submitted by the following member of staff\n\nCOURSE: "+WebCourse2+"\n\nSUBMITTED BY: "+WebUsername2+" \n\nPLEASE LOCK COURSE NOW IN ORDER TO PREVENT ANY FURTHER SUBMISSIONS TO BE MADE BY USERS.";
 os.writeBytes("Subject: A SUBMISSION HAS BEEN MADE FOR COURSE "+WebCourse2+"\r\n");
 os.writeBytes(sMessage + "\r\n");
 os.writeBytes("\r\n.\r\n");
 os.writeBytes("QUIT\r\n");
 // Now send the email off and check the server reply.
 // Once an OK is reached you are complete.
 String responseline;
 //for testing purposes
 //out.println(responseline = is.readLine());
 while((responseline = is.readLine())!=null)
 //for testing purposes
 //out.println("responseline= "+responseline+" ");
 //out.println("responseline.indexOf(Ok)= "+responseline.indexOf("Ok"));
 if(responseline.indexOf("Ok") != -1)
 break;
 if(responseline.indexOf("Ok") == -1)
 confirm=1;
 if (confirm==1)
 out.println(" the marks have been submitted thank you");
 catch(Exception e)
 { System.out.println("Cannot send email as an error occurred.");
 out.println("Cannot send email as an error occurred.");
 catch(Exception e)
 { System.out.println("Host " + m_sHostName + "unknown"); }
 //code used to send email ends here
do i need to close is and os?
thanks
tzaf

Sending email using java

Im using this code to do this, but i have a feeling that I need to close os and is is that the case? do i need to close anything else?
thanks
tzaf
//code used to send email starts here
 String m_sHostName="localhost";
 int m_iPort=25;
 try
 // Open port to server
 smtpSocket = new Socket(m_sHostName, m_iPort);
 os = new DataOutputStream(smtpSocket.getOutputStream());
 is = new DataInputStream(smtpSocket.getInputStream());
 if(smtpSocket != null && os != null && is != null)
 // Connection was made. Socket is ready for use.
 System.out.println("Connection was made. Socket is ready for use.");
 try
 // The email address that the server
 // you are using know user as.
 os.writeBytes("MAIL From: <[email protected]>\r\n");
 // Who the email is going to.
 os.writeBytes("RCPT To: <[email protected]>\r\n");
 //send a CC to:
 os.writeBytes("RCPT Cc: <[email protected]>\r\n");
 // add the message and the
 // header of the email to be sent out.
 os.writeBytes("DATA\r\n");
 os.writeBytes("X-Mailer: Via Java\r\n");
 os.writeBytes("From: "+WebUsername2+"<[email protected]>\r\n");
 os.writeBytes("To: Marie <[email protected]>\r\n");
 //Again if you want to send a CC then add this.
 os.writeBytes("Cc: ProfCuthbert <[email protected]>\r\n");
 String sMessage = "ELECTRONIC ENGINEERING EXAM COLLATION SYSTEM EMAIL\n\nThe results for the following course have been submitted by the following member of staff\n\nCOURSE: "+WebCourse2+"\n\nSUBMITTED BY: "+WebUsername2+" \n\nPLEASE LOCK COURSE NOW IN ORDER TO PREVENT ANY FURTHER SUBMISSIONS TO BE MADE BY USERS.";
 os.writeBytes("Subject: A SUBMISSION HAS BEEN MADE FOR COURSE "+WebCourse2+"\r\n");
 os.writeBytes(sMessage + "\r\n");
 os.writeBytes("\r\n.\r\n");
 os.writeBytes("QUIT\r\n");
 // Now send the email off and check the server reply.
 // Once an OK is reached you are complete.
 String responseline;
 //for testing purposes
 //out.println(responseline = is.readLine());
 while((responseline = is.readLine())!=null)
 //for testing purposes
 //out.println("responseline= "+responseline+" ");
 //out.println("responseline.indexOf(Ok)= "+responseline.indexOf("Ok"));
 if(responseline.indexOf("Ok") != -1)
 break;
 if(responseline.indexOf("Ok") == -1)
 confirm=1;
 if (confirm==1)
 out.println(" the marks have been submitted thank you");
 catch(Exception e)
 { System.out.println("Cannot send email as an error occurred.");
 out.println("Cannot send email as an error occurred.");
 catch(Exception e)
 { System.out.println("Host " + m_sHostName + "unknown"); }
 //code used to send email ends here

any thoughts?
thanks
tzaf

I am not able to send email using JAVA API to outer email

If I am trying to send email from my company account to yahoo I am getting following errors:
javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to relay
for [email protected]
at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1196)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:584)
at javax.mail.Transport.send0(Transport.java:169)
at javax.mail.Transport.send(Transport.java:98)
at MailSend.main(MailSend.java:116)
Caused by: com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to rel
ay for [email protected]
at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1047)
... 4 more
com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to relay for mkba
[email protected]
at com.sun.mail.smtp.SMTPTransport.rcptTo(SMTPTransport.java:1047)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:584)
at javax.mail.Transport.send0(Transport.java:169)
at javax.mail.Transport.send(Transport.java:98)
at MailSend.main(MailSend.java:116)
Please let me know the reason for the same.

Unable to relay - This happened because your Company network don't permit relay. Do talk to the network administrator and check with way safe you can send.
I got the same problem, now im using through gmail.

Send Email using Java

May i know how to send the email by using java?

heres my final i did for java 1 last year (it was a simple email sending program:
//java FINAL!
import javax.swing.*;
import java.net.URL;
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
public class EmailProg extends JPanel implements ActionListener {
    protected JTextArea textArea;
    protected String newline = "\n";
    static final private String composemail = "compose";
    static final private String sendmail = "send";
    static final private String about = "about";
    static final private String submit = "submit";
    static final private String exit = "exit";
    JLabel lSubmit = new JLabel("Submit");
    JButton subbutton = new JButton();
    JTextArea emailfrom = new JTextArea(1,1);
    JTextArea emailto = new JTextArea(1, 1);
    JTextArea emailsubject = new JTextArea(1, 1);
    JTextArea emailmessage = new JTextArea(25, 1);
    //------BAG LAYOUT
    JLabel lFrom = new JLabel("From:");
    JTextField cFrom = new JTextField(32);
    JLabel lTo = new JLabel("To:");
    JTextField cTo = new JTextField(32);
    JFrame frame2 = new JFrame("Compose New");
    JLabel lSubject = new JLabel("Subject");
    JTextField cSubject = new JTextField(32);
    JLabel lMessage = new JLabel("Body");
    JTextArea cMessage = new JTextArea(5,32);
    //====================================
    public EmailProg() {
        super(new BorderLayout());
        //Create the toolbar.
        JToolBar toolBar = new JToolBar();
        addButtons(toolBar);
        //Create the text area used for output. Request
        //enough space for 5 rows and 30 columns.
        textArea = new JTextArea(5, 30);
        textArea.setEditable(false);
        textArea.setText("Welcome to Jeff's email program! With this program you can compose and send emails. I hope I get a good grade on thise, and marine world finds a good use for it :-D:-D (implements really just testing the scroller!!!)");
        JScrollPane scrollPane = new JScrollPane(textArea);
        //Lay out the main panel.
        setPreferredSize(new Dimension(450, 110));
        add(toolBar, BorderLayout.NORTH);
        add(scrollPane, BorderLayout.CENTER);
    //==================================
    protected void addButtons(JToolBar toolBar) {
        JButton button = null;
        //first button
        button = makeNavigationButton("/toolbarButtonGraphics/general/ComposeMail24.gif", composemail ,"Compose new Email", "compose new");
        toolBar.add(button);
        //second button
        button = makeNavigationButton("toolbarButtonGraphics/general/SendMail24.gif", sendmail,"Send The Mail","send");
        toolBar.add(button);
        //third button
        button = makeNavigationButton("toolbarButtonGraphics/general/About24.gif", about,"About","About");
        toolBar.add(button);
        //exit button
        button = makeNavigationButton("toolbarButtonGraphics/general/Stop24.gif", exit, "Exit", "Exit");
        toolBar.add(button);
    //===================================
    protected JButton makeNavigationButton(String imageName, String actionCommand, String toolTipText, String altText) {
        //Look for the image.
        String imgLocation = imageName;
        URL imageURL = EmailProg.class.getResource(imgLocation);
        //Create and initialize the button.
        JButton button = new JButton();
        button.setActionCommand(actionCommand);
        button.setToolTipText(toolTipText);
        button.addActionListener(this);
        if (imageURL != null) {                      //image found
            button.setIcon(new ImageIcon(imageURL));
        } else {                                     //no image found
            button.setText(altText);
            System.err.println("Resource not found: "+ imgLocation);
        return button;
    //=============================
    public void actionPerformed(ActionEvent e) {
        String cmd = e.getActionCommand();
        String description = null;
        // Handle each button.
        if (exit.equals(cmd)){
            textArea.setText("");
            description = "EXITING";
            System.exit(0);
        if (composemail.equals(cmd)) { //first button clicked
            textArea.setText("");
            description = "Write new mail.";
            composeWindow();
        } else if (sendmail.equals(cmd)) { // second button clicked
            textArea.setText("");
            description = "This button does'nt do anything yet :x";
        } else if (about.equals(cmd)) { // third button clicked
            textArea.setText("");
            description = "About this program. (See pop-up)";
            coolWindow();
        else if (submit.equals(cmd))
            if (cFrom.getText().equals("")||cTo.getText().equals("")||cSubject.getText().equals("")||cMessage.getText().equals(""))
                textArea.setText("One or more of the fields was not filled in.");
            else{
                  try {
                            String smtpServer="serverhere";
                            String to=cTo.getText();
                            String from=cFrom.getText();
                            String subject=cSubject.getText();
                            String body=cMessage.getText();
                            send(smtpServer, to, from, subject, body);
                            textArea.setText("");
                            description = "Mail Sent.";
                            JOptionPane.showMessageDialog(null, "Message Sent.");
        catch (Exception ex)
            System.out.println("Usage: java com.lotontech.mail.SimpleSender"
            +" smtpServer toAddress fromAddress subjectText bodyText");
                //CLOSE THE FRAME2 WINDOW IIIIIIIIFFFFFFF SENDING IS SUCCESSFUL!!
            }//end of else during send
       }//end of if of submit
        displayResult(description);
    //============================
    protected void displayResult(String actionDescription) {
        textArea.append(actionDescription + newline);
    //=============================
    public void coolWindow() {
        JFrame frame = new JFrame("About");
        JTextArea filecontents = new JTextArea();
        filecontents.setText("Use the tool bar to compose\n compose new emails, in which you can\n send to anyone on the\n srvhs email server. \n Fill in all the blanks before pressing send. If you dont\n you will receive an error! \n For more information about this program click on the\n information button.");
        frame.getContentPane().add(filecontents, BorderLayout.CENTER);
        frame.pack();
        frame.setResizable(false);
        frame.setSize(300,200);
        frame.setVisible(true);
     //===============================
    public void composeWindow() {
        frame2.getContentPane().setLayout(new GridBagLayout());
        frame2.setResizable(false);
        frame2.setSize(600,500);
        frame2.setVisible(true);
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(5, 10, 5, 10);
        cMessage.setLineWrap(true);
        subbutton = makeNavigationButton("toolbarButtonGraphics/general/SendMail24.gif", submit,"submit","submit");
        addRow(gbc, lFrom, cFrom);
        addRow(gbc, lTo, cTo);
        addRow(gbc, lSubject, cSubject);
        addRow(gbc, lMessage, cMessage);
        addRow(gbc, lSubmit, subbutton);
    //===============================
    private void addRow(GridBagConstraints gbc, Component left, Component right) {
        gbc.gridx = GridBagConstraints.RELATIVE;
        gbc.gridy = GridBagConstraints.RELATIVE;
        gbc.gridheight = 1;
        gbc.gridwidth = 1;
        gbc.anchor = GridBagConstraints.EAST;
        frame2.getContentPane().add(left, gbc);
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.anchor = GridBagConstraints.WEST;
        frame2.getContentPane().add(right, gbc);
        frame2.pack();
   //=======================
    public static void send(String smtpServer, String to, String from, String subject, String body) {
    try {
      Properties props = System.getProperties();
      props.put("mail.smtp.host", smtpServer);
      Session session = Session.getDefaultInstance(props, null);
      // -- Create a new message --
      Message msg = new MimeMessage(session);
      // -- Set the FROM and TO fields --
      msg.setFrom(new InternetAddress(from));
      msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to, false));
      // -- We could include CC recipients too --
      // if (cc != null)
      // msg.setRecipients(Message.RecipientType.CC
      // ,InternetAddress.parse(cc, false));
      // -- Set the subject and body text --
      msg.setSubject(subject);
      msg.setText(body);
      // -- Set some other header information --
      msg.setHeader("X-Mailer", "LOTONtechEmail");
      msg.setSentDate(new Date());
      // -- Send the message --
      Transport.send(msg);
      System.out.println("Message sent OK.");
    catch (Exception ex)
      ex.printStackTrace();
    public static void main(String[] args) {
        JFrame frame = new JFrame("EmailProg");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        EmailProg newContentPane = new EmailProg();
        newContentPane.setOpaque(true);
        frame.setContentPane(newContentPane);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
}

Can I send email using Java from my localhost(Tomcat) with Internet connect

Hi friends,
Please tell me can I send email from my localhost (Tomcat) using Java when my computer is connected to Internet?
I don't have any SMTP username or password or the like, as I found in some codes available in net.
Please suggest and any simple code if possible.
Please don't send me the link of JavaMail API to read.
---Sujoy

Thank you for the link. Though I have not tested the provided code, I will test it.
--Sujoy

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iTunes and encrypted backups
You can protect your backup with a passcode using the Encrypt Backup option in the Summary tab. Encrypting your backup will back up your Keychain. This way, your email account passwords, Wi-Fi passwords, and passwords that you enter into websites and some apps will be remembered when you transfer to a new device. Learn how to create and restore from a backup.
When your backup is encrypted, you'll need to enter the password when enabling or disabling encryption or when restoring from the backup.

I'm on 8.6 and want to upgrade to 10.3 - what do I need to know and watch 4

I'm on 8.6 and want to upgrade to 10.3 - what do I need to know and watch out for. I have a friend who lost all of thier i-tunes when they upgraded. I do not want that to happen. Will I loose other information ie - email addresses? Any suggestions and help are welcome for a smooth transition.

David, welcome to the discussions.
Look this link over and see if it answers your questions.
I would get anything you need to keep from OS8 on an external of some sort or back it all up so you can retrieve it.
http://discussions.apple.com/thread.jspa?messageID=607596
Don

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