Andrew thanks for your reply,

what i forgot to mention in my previous post is that:

when doing Get Mail thunderbird pops up a dialog saying "Sending of password did not suceed. Mail server localhost responded: Mailbox locked"

and i get this in the console
----Beginning dump---
23:25:42,362 INFO [Server] waiting for request
23:25:42,452 INFO [ConnectionHandler] connected: /127.0.0.1 to: /127.0.0.1 until: 1155932862359
23:25:42,947 ERROR [STDERR] javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated
23:25:42,948 ERROR [STDERR] at com.sun.net.ssl.internal.ssl.SSLSessionImpl.getPeerCertificates(SSLSessionImpl.java:352)
23:25:42,949 ERROR [STDERR] at org.jboss.mail.pop3.handlers.CmdSTLS$1.handshakeCompleted(CmdSTLS.java:110)
23:25:42,949 ERROR [STDERR] at com.sun.net.ssl.internal.ssl.SSLSocketImpl$NotifyHandshakeThread$1.run(SSLSocketImpl.java:2064)
23:25:42,949 ERROR [STDERR] at java.security.AccessController.doPrivileged(Native Method)
23:25:42,950 ERROR [STDERR] at com.sun.net.ssl.internal.ssl.SSLSocketImpl$NotifyHandshakeThread.run(SSLSocketImpl.java:2062)
23:25:48,544 WARN [CmdUSER] pop username set to cvasilak
23:25:48,715 ERROR [STDERR] java.lang.NullPointerException
23:25:48,716 ERROR [STDERR] at org.jboss.mail.pop3.POP3ProtocolInstance.lock(POP3ProtocolInstance.java:377)
23:25:48,716 ERROR [STDERR] at org.jboss.mail.pop3.handlers.CmdPASS.handleRequest(CmdPASS.java:102)
23:25:48,717 ERROR [STDERR] at org.jboss.mail.pop3.POP3ProtocolInstance.handleRequest(POP3ProtocolInstance.java:211)
23:25:48,717 ERROR [STDERR] at org.jboss.mail.ConnectionHandler.runSocket(ConnectionHandler.java:205)
23:25:48,718 ERROR [STDERR] at org.jboss.mail.ConnectionHandler.run(ConnectionHandler.java:97)
23:25:48,718 ERROR [STDERR] at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:743)
23:25:48,718 ERROR [STDERR] at java.lang.Thread.run(Thread.java:619)
23:25:48,854 INFO [ConnectionHandler] ConnectionHandler finished

---End of Dump---

Further, when trying to send a message thunderbird succeeds on sending but...on the server i get the following in the console: (Don't know if the mail is on the store cause i can't get mail as said earlier.)

----Beginning dump---
23:35:39,427 INFO [ConnectionHandler] connected: /127.0.0.1 to: /127.0.0.1 until: 1155933459426
23:35:39,829 ERROR [STDERR] javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated
23:35:39,830 ERROR [STDERR] at com.sun.net.ssl.internal.ssl.SSLSessionImpl.getPeerCertificates(SSLSessionImpl.java:352)
23:35:39,830 ERROR [STDERR] at org.jboss.mail.smtp.handlers.CmdSTARTTLS$1.handshakeCompleted(CmdSTARTTLS.java:104)
23:35:39,831 ERROR [STDERR] at com.sun.net.ssl.internal.ssl.SSLSocketImpl$NotifyHandshakeThread$1.run(SSLSocketImpl.java:2064)
23:35:39,831 ERROR [STDERR] at java.security.AccessController.doPrivileged(Native Method)
23:35:39,831 ERROR [STDERR] at com.sun.net.ssl.internal.ssl.SSLSocketImpl$NotifyHandshakeThread.run(SSLSocketImpl.java:2062)
23:35:40,094 INFO [Mail] all headers after loading: Return-Path: <cvasilak@gmail.com>
Received: from null (localhost 127.0.0.1) by localhost/JBossMail 1.0M5-pre1 (127.0.0.1)
with SMTP id 1155933340093922.8840450927628; Fri, 18 Aug 2006 23:35:40 +0300 (EEST)
Message-ID: <44E6249B.6090009@gmail.com>
Date: Fri, 18 Aug 2006 23:35:39 +0300
From: Christos Vasilakis <cvasilak@gmail.com>
User-Agent: Thunderbird 1.5.0.5 (X11/20060728)
MIME-Version: 1.0
To: Christos Vasilakis <cvasilak@localhost>
Subject: Test
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

23:35:40,104 INFO [AbstractStore] Creating store item
---End of Dump---

I followed the WIKI and configure the mailbox in the JMX console.
FYI I am using postgres as the backend.

What does it mean mailbox is locked?

Thanks in advance
Christos