Email Delivery Error

Question

Hi,When I use the following code to send Email,Certificates are required.If no attachment,the delivery will succeed.If attached,the program failed as the following "javax.mail.MessagingException: IOException while sending message; nested exception is: java.io.FileNotFoundException: C:\mail\attachment.txt can't find" Please help.
Properties props = new Properties();
     props.put("mail.smtp.host",host);
     props.put("mail.smtp.auth","true");
     Session sendMailSession= Session.getInstance(props, null);
     Store store;
     Transport transport;
     InternetAddress[] address;
     if((to!=null)&&(from!=null))
     Message newMessage = new MimeMessage(sendMailSession);
     newMessage.setRecipient(Message.RecipientType.TO,new InternetAddress(to));
newMessage.setFrom(new InternetAddress(from));
     if(cc.length()>0)
          newMessage.setRecipient(Message.RecipientType.CC,new InternetAddress(cc));
     if(bcc.length()>0)
     newMessage.setRecipient(Message.RecipientType.BCC,new InternetAddress(bcc));
     if(subject!=null){
subject = new java.lang.String(subject.getBytes("GB2312"));
newMessage.setSubject(subject);
     if(attchfile.length()<1)
     newMessage.setText(body);
     else
          {//attachment
          MimeBodyPart bodyPart1=new MimeBodyPart();
          bodyPart1.setText(body);
          Multipart allpart=new MimeMultipart();
          allpart.addBodyPart(bodyPart1);
          MimeBodyPart bodyPart2=new MimeBodyPart();
FileDataSource filedata=new FileDataSource(attchfile);
bodyPart2.setDataHandler(new DataHandler(filedata));
bodyPart2.setFileName(filedata.getName());
     out.print(filedata.getName());
          allpart.addBodyPart(bodyPart2);
newMessage.setContent(allpart);
     newMessage.saveChanges();
     transport = sendMailSession.getTransport("smtp");
transport.connect(host,user,password);
newMessage.setSentDate(new Date());
transport.sendMessage(newMessage,newMessage.getAllRecipients());
transport.close();

Answer 1

"java.io.FileNotFoundException: C:\mail\attachment.txt can't find"
Seems clear to me...