Help me please, JavaMail

[Hussein Baghdadi]

Hi guys.
I have wrote a simple Java class to send an email to "[e-mail]"
address from the "[e-mail]" adress.

 
import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;
public class SendMail {
    public static void main(String[] args) {
        // Get properties object
        Properties props = System.getProperties();
        // Define SMTP host property
        props.put("mail.smtp.host","mail.lycos.com");
        try {
            // Get a session
            Session session = Session.getDefaultInstance(props,null);
            // Create a new message object
            MimeMessage message = new MimeMessage(session);
            // Populate message object
            message.setText("Hello from first JavaMail message");
            message.setSubject("Hi!");
            message.setFrom(new InternetAddress("[e-mail]"));
            message.addRecipient(Message.RecipientType.TO,new InternetAddress("[e-mail]"));
            System.out.println("Message Sent");
            // Send the message
           Transport.send(message);
        }
        catch (MessagingException me) {
            System.err.println(me.getMessage());
        }
    }
} 

but I have got the following exceptions :
MessagingException : could not connect to SMTP host mail.lycos.com, port 25
nested exception is : SocketException : Network is unreachable
so, is mail.smtp.host property refers to the reciever host or to sender host ??
is every smtp mail server has the following format : mail.smtp.host
like : mail.smtp.yahoo or mail.yahoo.com ??
please, I need help, because JavaMail is a vital subject me....

[Peter KelleyNH]

SMTP name is for the Send Mail Transport Protocol** -- It's the name of a host that will send your message. Take a peek in your regular email program options and you'll probably see the info you need to plug. If that doesn't help perhaps you could discuss with a network admin or whoever set up your email for the correct SMTP (aka SendMail) address.
PKNH
** exact acronym I'm not sure -- could be Send Mail Transport Program but you get the idea. PKNH

[Hanna Habashy]

Hi John:
I just have a question for you. Why are you using Session.getDefaultInstance() method as oppose to Session.getInstance(). When you use getDefualtInstance it return a Session object that is shared among all application running in the same JVM. Isn't a security hole? for example, if another application reset the security parameters on the defualt Session instance, then your application will not be able to access it anymore.
I am not criticising your choice, I just want to know why?
thanks

[eammon bannon]

SMTP name is for the Send Mail Transport Protocol
...
exact acronym I'm not sure -- could be Send Mail Transport Program but you get the idea. PKNH

*Ahem* - its actually Simple Mail Transfer Protocol (See RFC 821 which defines it). I could also point out its not an acronym, but I might get thrown out of the forum for being far too smug...