Javax.mail.SendFailedException: 550 5.7.1 Unable to relay

Question

Hi All,
I am getting the below Exception message when I am executing my JavaMail
program.
nested exception is:
     javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
     javax.mail.SendFailedException: 550 5.7.1 Unable to relay for [email protected]
Please can anyone help me out.
Regards,
Ravi.

Answer 1

what's wrong to this source code, if try to send mail to local account actually it success, but if i try to send mail eg:[email protected](outside my network) i found error this error to. i had to try not use encode userID/password into base64, but the result doesn't change.
if anyone have solution for this problem, please contact me @ [email protected]
Regards,
agam
error returned by java:
javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
class javax.mail.SendFailedException: 550 Relaying is prohibited
void com.sun.mail.smtp.SMTPTransport.sendMessage(javax.mail.Message, javax.mail.Address[])
import java.util.*;
import java.io.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
import com.sun.mail.smtp.SMTPTransport;
import com.agam198.util.*;
public class PCMMail{
String sMailServer = "";
String sUserID = "";
String sPassword = "";
int iPort = 25;
String sTo = "";
String sFrom = "";
String sCC = "";
Message msg = null;
SMTPTransport transport = null;
Transport trns = null;
public PCMMail(StringPool sPool){
this.sMailServer = sPool.getString("SMTPServer.SERVER");
this.sTo = sPool.getString("SMTPAlert.TO");
this.sFrom = sPool.getString("SMTPAlert.FROM");
this.sCC = sPool.getString("SMTPAlert.CC");
this.sUserID = sPool.getString("SMTPServer.LOGIN");
this.sPassword = sPool.getString("SMTPServer.PASSWORD");
this.iPort = Integer.parseInt(sPool.getString("SMTPServer.PORT"));
initConnection();
public void initConnection(){
try{
System.out.println("MailServer: "+sMailServer);
System.out.println("To: "+sTo);
System.out.println("From: "+sFrom);
System.out.println("CC: "+sCC);
Properties props = new Properties();
props.put("mail.smtp.host", "152.118.89.0");
Session session = Session.getDefaultInstance(props,null);
trns = session.getTransport("smtp");
if(trns == null){
System.out.println("trans is not null");
else
System.out.println("trans null");
trns.connect(sMailServer,Base64.base64Encode ( sUserID ),Base64.base64Encode ( sPassword ));
if(trns.isConnected()){
System.out.println("connected to SMTP SERVER");
else{
System.out.println("not connect");
InternetAddress address = new InternetAddress();
//create a message
msg = new MimeMessage(session);
catch(Exception e){
public void sendMessage(String message){
sendMessage(getFirstLine(message),message);
public void sendMessage(String subject,String message){
try{
//prepare message
msg.setFrom(new InternetAddress(sFrom));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(sTo));
msg.setSubject(subject);
msg.setSentDate(new Date());
msg.setText(message);
trns.send(msg);
System.out.println("message sent");
catch(Exception e){
e.printStackTrace();
public String getFirstLine(String message){
BufferedReader buf = new BufferedReader(new StringReader(message));
try{
return buf.readLine();
catch(Exception e){
return " ";
public static void main(String[] args){
StringPool sp = new StringPool();
sp.set("SMTPServer.SERVER","152.118.89.0");
sp.set("SMTPServer.PORT","25");
sp.set("SMTPServer.LOGIN","kiara");
sp.set("SMTPServer.PASSWORD","kiara");
sp.set("SMTPAlert.TO","[email protected]");
sp.set("SMTPAlert.FROM","[email protected]");
sp.set("SMTPAlert.CC","");
PCMMail pcm = new PCMMail(sp);
pcm.sendMessage("subject","message body");
}