Sending email using java

Question

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+"<br>");
                                                                      //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("<br>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

Answer 1

any thoughts?
thanks
tzaf