JavaMail

<%@ page import="java.util.*, javax.mail.*, javax.mail.internet.*" %>
<%
Properties props = new Properties();
props.put("mail.smtp.host", "xxxx");
Session s = Session.getInstance(props,null);

MimeMessage message = new MimeMessage(s);

InternetAddress from = new InternetAddress("[email protected]");
message.setFrom(from);
InternetAddress to = new InternetAddress("[email protected]");
message.addRecipient(Message.RecipientType.TO, to);

message.setSubject("Test from JavaMail.");
message.setText("Hello from JavaMail!");

Transport.send(message);
%>

1)I have put my smtp mail host
The error I get is

javax.mail.SendFailedException: Sending failed;
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 help

I'm not sure, but it looks like your email server is refusing to do just what it says it's not doing, "to relay for [email protected]".

From the same machine that you're attempting to run this Java code, can you telnet to port 25 on the email server and send an email "by hand" from [email protected]?

most mailservers will refuse to send mail that's not sent from their own domains using addresses in that domain.

This is to prevent them from being used as spam relays as well as to prevent non-customers/employers using a company's services without paying (bandwidth theft).

Talk to your network admins about which mailserver you can use, there's probably one.

I'm going to move this to "Other Java APIs," where JavaMail questions go.