Getting nested exception(Unknown SMTP host)

Question

hello
i have written a simple mailclient.i am running the following programme from my local machine which is under proxy server.
public class MailExample {
public static void main (String args[]) throws Exception {
String host = "mail.ab";
String from = "[email protected]";
String to = "[email protected]";
Properties props = System.getProperties();
props.put("mail.smtp.host", host);
Session session = Session.getDefaultInstance(props, null);
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.addRecipient(Message.RecipientType.TO,
new InternetAddress(to));
message.setSubject("Hello JavaMail");
message.setText("Welcome");
Transport.send(message);
This host is some other machine.
i am getting nested exception as unknown SMTP host.
please help.
thanks in advance

Answer 1

Unknown host: it is telling you that it can't find the host you told it to look for. Either you gave it the name of a system that does not exist, or that system does not have an SMTP host running on it. I would guess the first reason, as "mail.ab" does not look right to me. (What country is "ab" and why is there only one mail server in the entire country?)