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From: Nigel Wade <nmw-news@ion.le.ac.uk>
Newsgroups: comp.lang.java.programmer
Subject: Re: JavaMail bug?
Date: Tue, 02 Aug 2011 16:34:20 +0100
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On 01/08/11 22:49, Martin Gregorie wrote:
> On Mon, 01 Aug 2011 13:20:09 +0100, Nigel Wade wrote:
>
>> What does my code do if you run it exactly as is? Does it attempt to
>> connect to yahoo.com or our mail server (you won't actually be able to
>> connect, it's blocked on port 25)?
>>
> It fails connecting to your server.

Yes, well, that's what I said would happen.

>
> So, where does THAT leave us?

With the fact that it /attempted/ to connect to our mail server - not 
localhost, and not yahoo.com.

> The only difference is that you call
> getDefaultInstance(props) while I call getInstance(props) and, according
> to the documentation, these should do exactly the same the first time
> they're called.

I see the same behaviour with either getDefaultInstance() or 
getInstance() - it connects to our mail server.

>
> BTW, I added the single property setting line to my application code so
> that it uses the same hostname for 'mail.smtp.host' as connect(host,
> user, passwd) does. That code now connects directly to the expected
> server.
>
> What does my SSCE do in your environment?

I get:

javax.mail.MessagingException: Unknown SMTP host: zoogz.gregorie.org;
   nested exception is:
         java.net.UnknownHostException: zoogz.gregorie.org

I presume your DNS does not propagate upward from your zone. But it /is/ 
attempting to resolve that hostname via our DNS servers. It's not using 
localhost.


-- 
Nigel Wade