Re: JavaMail bug?

Nigel Wade <>
Mon, 25 Jul 2011 15:40:44 +0100
On 23/07/11 21:32, Martin Gregorie wrote:

I seem to have found a JavaMail-1.4.4 bug

If I try to open an SMTP connection by obtaining a transport instance
and then calling connect():

             Transport tr = sesh.getTransport("smtp");
             tr.connect(host, user, password);

    sesh is the current mail session,
    host is ""
    user is "kiwi"
         and password is a valid password for the user

Transport.connect() sets up the URLName "smtp://",
which is what I expect, but then promptly fails with:

    Could not connect to SMTP host: localhost, port: 25;
nested exception is: Connection refused

when the local Postfix MTA on the machine I'm connecting from
( is stopped.

If I restart the local Postfix instance the connect request succeeds and
the mail message is sent, but its headers clearly show that JavaMail
delivered it to the local MTA, which then passed it to the Postfix MTA on, which has been listening on port 25 the whole time.

IOW the Transport.connect(host,user,password) method sets up its target
URL as expected but then promptly ignores it and defaults to connecting
to localhost on port 25.

That certainly seems to be the problem. The MessagingException shows
it's failing to connect to localhost.

Have any of you seen this problem?

No, mine works as expected. At least, when I attempt a simple
Transport.connect(host, user, pwd) it connects to my SMTP server on port
25. It doesn't authenticate because my SMTP server doesn't offer AUTH on
port 25. But it does connect to the correct host.

Have I done anything stupid?

Hard to say with the limited code you've provided.

This is the code I'm testing with.

import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class TestMail {

   static String SMTP_SERVER = "";

   public static void main(String[] args) {

     // Get system properties
     Properties props = System.getProperties();

     // Setup mail server
     props.put("", SMTP_SERVER);

     // Get session
     Session session = Session.getDefaultInstance(props, null);

     try {
       Transport tr = session.getTransport("smtp");
       tr.connect("", "user", "password");
     catch(MessagingException e) {


The value of the parameter host to connect() is overriding that set in
the Properties, which the correct behaviour. The URL output is:

I see the connection on, and the SMTP handshake, using

My guess is that there's a mistake somewhere in the code you haven't
shown us yet.

BTW, what version of JavaMail are you using? I've tested the above code
with both 1.3.1 and 1.4.4.

Nigel Wade

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