JavaMail attempted to open an SMTP connection to your mail server.
The server was supposed to send a response code (e.g. 220 = connection ready, other codes for other states or errors), but no code was received at all (hence the "EOF" debug statement).
I'm not familiar enough with mail servers at the moment to speculate as to why that might happen.
Can you send mail with a regular client? What about some of the javamail examples in the demo folder? Do they work with this server? What server is it?
[Message sent by forum member 'peterwx' (peterwx)]
http://forums.java.net/jive/thread.jspa?messageID=230534