JavaMail sendingemail & mail server

Question

Hi, all.
I recently try to use javamail.
and i get the code from internet:
this is the code :
<%
    java.util.Properties props = new java.util.Properties();
   // props.clear();
   // props.remove("mail.smtp.host");
    props.put("mail.smtp.host","127.0.0.1");
    javax.mail.Session s = javax.mail.Session.getDefaultInstance(props,null);
    s.setDebug(true);
    javax.mail.Message msg = new javax.mail.internet.MimeMessage(s);
    javax.mail.internet.InternetAddress addressFrom = new javax.mail.internet.InternetAddress ("[email protected]");
    msg.setFrom(addressFrom);
    javax.mail.internet.InternetAddress addressTo = new javax.mail.internet.InternetAddress ("[email protected]");
    msg.setRecipient(javax.mail.Message.RecipientType.TO,addressTo);
    msg.setSubject("HALO");
    msg.setContent("<H1>Hallo</H1>","text/plain");
    javax.mail.Transport tr = s.getTransport("smtp");
    tr.send(msg);
// Setup mail server
%>i confused about this code
props.put("mail.smtp.host","127.0.0.1");how to know what is my mail server name ?
i really don't know about this.
i use IIS 5.1
i success to send email without error message but when i tried to look the email, it didn't exist.
can someone help me ?
Thanks

Answer 1

Thanks guys, i have succeed to sen email using javaMail.
I thinks it's not working but, turn out that my email at plasa.com maybe having some difficulties or another reason, i don't know.