Error: "javax.mail.MessagingException: 505 5.7.3 Client not Authenticated

Question

While trying to run a program to sent sms to mobile(with airtel connection)it shows the Error:
"javax.mail.MessagingException: 505 5.7.3 Client was not Authenticated.
If anyone knows how to resolve this problem please reply.
The Code is as follows:
import java.io.*;
import java.net.InetAddress;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
public class EmailSMS
String TO;
String FROM;
String SUBJECT,TEXT,MAILHOST,LASTERROR;
public static void main(String [] args) throws Exception
     EmailSMS SMS=new EmailSMS();
     SMS.setMailHost("kcsl.com");
     SMS.setTo("[email protected]");
     SMS.setFrom("[email protected]");
     SMS.setSubject("");
     SMS.setText("Hello World");
     boolean ret = SMS.send();
     if(ret){
          System.out.println("SMS was sent");
     else
          System.out.println("SMS was not sent"+SMS.getLastError());
public EmailSMS()
     TO=null;
     FROM=null;
     SUBJECT=null;
     TEXT=null;
     LASTERROR="No methods calls";
public void setTo(String to){TO=to;}
public String getTo(){return TO;}
public void setFrom (String from){FROM=from;}
public String getFrom(){ return FROM;}
public void setSubject(String subject){SUBJECT=subject;}
public String getSubject(){return SUBJECT;}
public void setText(String text){TEXT=text;}
public void setMailHost(String host){MAILHOST=host;}
public String getMailHost(){return MAILHOST;}
public String getLastError(){return LASTERROR;}
public boolean send()
     int maxLength;
     int msgLength;
     //Check to make sure that the parameters are correct
     if(TO.indexOf("mobile.att.net")>0)
          maxLength=140;
     else if(TO.indexOf("messaging.nextel.com")>0)
     {maxLength=280;}
     else if(TO.indexOf("messaging.sprintpcs.com")>0)
     {maxLength=100;}
     else maxLength=160;
     msgLength=FROM.length()+1+SUBJECT.length()+1+TEXT.length();
     if(msgLength>maxLength)
          LASTERROR="SMS length too long";
          return false;
     //set email properties
     Properties props=System.getProperties();
     if(MAILHOST!=null){props.put("mail.smtp.host",MAILHOST);}
     Session session=Session.getDefaultInstance(props,null);
     try{
          Message msg=new MimeMessage(session);
          if(FROM!=null){msg.setFrom(new InternetAddress(FROM));}
          else{msg.setFrom();}
          msg.setSubject(SUBJECT);
          msg.setText(TEXT);
          msg.setRecipients(Message.RecipientType.TO,InternetAddress.parse(TO,false));
          msg.setSentDate(new Date());
          Transport.send(msg);
          LASTERROR="Success";
          return true;
     catch(MessagingException max ){LASTERROR=max.getMessage();
     return false;}
thanku

Answer 1

Hi,
it seems to me that you must authenticate with your smtp host. In order to do so, try following:
While trying to run a program to sent sms to
mobile(with airtel connection)it shows the Error:
"javax.mail.MessagingException: 505 5.7.3 Client was
not Authenticated.
If anyone knows how to resolve this problem please
reply.
The Code is as follows:
import java.io.*;
import java.net.InetAddress;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
public class EmailSMS
String TO;
String FROM;
String SUBJECT,TEXT,MAILHOST,LASTERROR;
public static void main(String [] args) throws
Exception
     EmailSMS SMS=new EmailSMS();
     SMS.setMailHost("kcsl.com");
     SMS.setTo("[email protected]");
     SMS.setFrom("[email protected]");
     SMS.setSubject("");
     SMS.setText("Hello World");
     boolean ret = SMS.send();
     if(ret){
          System.out.println("SMS was sent");
     else
System.out.println("SMS was not
t sent"+SMS.getLastError());
public EmailSMS()
     TO=null;
     FROM=null;
     SUBJECT=null;
     TEXT=null;
     LASTERROR="No methods calls";
public void setTo(String to){TO=to;}
public String getTo(){return TO;}
public void setFrom (String from){FROM=from;}
public String getFrom(){ return FROM;}
public void setSubject(String
subject){SUBJECT=subject;}
public String getSubject(){return SUBJECT;}
public void setText(String text){TEXT=text;}
public void setMailHost(String host){MAILHOST=host;}
public String getMailHost(){return MAILHOST;}
public String getLastError(){return LASTERROR;}
public boolean send()
     int maxLength;
     int msgLength;
     //Check to make sure that the parameters are correct
     if(TO.indexOf("mobile.att.net")>0)
          maxLength=140;
     else if(TO.indexOf("messaging.nextel.com")>0)
     {maxLength=280;}
     else if(TO.indexOf("messaging.sprintpcs.com")>0)
     {maxLength=100;}
     else maxLength=160;
     msgLength=FROM.length()+1+SUBJECT.length()+1+TEXT.leng
h();
     if(msgLength>maxLength)
          LASTERROR="SMS length too long";
          return false;
     //set email properties
     Properties props=System.getProperties();
     if(MAILHOST!=null){props.put("mail.smtp.host",MAILHOST
Session
session=Session.getDefaultInstance(props,null);
     try{     // Get a Transport object to send e-mail
               Transport bus = session.getTransport("smtp");
               // Connect only once here
               // Transport.send() disconnects after each send
               bus.connect(host, username, password);
          Message msg=new MimeMessage(session);
if(FROM!=null){msg.setFrom(new
w InternetAddress(FROM));}
          else{msg.setFrom();}
          msg.setSubject(SUBJECT);
          msg.setText(TEXT);
          msg.setRecipients(Message.RecipientType.TO,InternetAd
ress.parse(TO,false));
          msg.setSentDate(new Date());// Send message
          bus.send(msg);
          bus.close();
          LASTERROR="Success";
          return true;
catch(MessagingException max
){LASTERROR=max.getMessage();
     return false;}
thankuGood luck