Sending mail problem (please help)

Question

I have downloaded all necessary components javamail-1_2.zip and jaf1_0_1.zip. I included them in my classpath too (activation.jar and mail.jar). I used Exchange Server 2000 as smtp server. But when i try sending an email the message appears like this:
sending error cannot relay for sending [email protected]
When i tried the same code in my ISP (www.mycgiserver.com) it work very fine. Here is the code. Where is the problem? Please help me...
<%
// Take massege properties
String mBody = request.getParameter("mBody");
String from1 = request.getParameter("from");
String to1 = request.getParameter("to");
String subject = request.getParameter("subject");
Properties props = new Properties();
props.put("ipNo.........:25", "smtp.mail.blah.com");
Session s = Session.getInstance(props,null);
Message message = new MimeMessage(s);
InternetAddress from = new InternetAddress(from1);
message.setFrom(from);
InternetAddress to = new InternetAddress(to1);
message.setRecipient(Message.RecipientType.TO, to);
message.setText(mBody);
message.setSubject(subject);
Transport.send(message);
%>

Answer 1

the problem i feel is in your smtp relay and probably not in ur code . some smtp relay servers are configured such that they relay only on authentication or from a specific IP or from a specific subnet mask only to prevent spammers . check out the info on ur local relay server and also see other postings specific on relay ....that shud be of help i guess