Problems changing the default configuration of JBoss Mail service - email

Question

Right now i have to make migration of one application.
Basic configuration:
JBOSS 5.1.0 GA
Seam 2.2.0.GA
JBPM 3.2.2
RichFaces 3.3.1.GA
Hibernate 3.3.1.GA
OS: Debian/Linux
Application has been deployed on JBoss server with its own configuration.
On old machine there was postfix (localhost, port 25) for sending messages.
On new machine i have different host and port.
What i have now in components.xml:
<mail:mail-session session-jndi-name="java:/Mail" />
My mail-service.xml:
<mbean code="org.jboss.mail.MailService"
name="jboss:service=Mail">
<attribute name="JNDIName">java:/Mail</attribute>
<attribute name="User">XXX</attribute>
<attribute name="Password">XXX</attribute>
<attribute name="Configuration">
<!-- A test configuration -->
<configuration>
<!-- Change to your mail server prototocol -->
<property name="mail.store.protocol" value="pop3"/>
<property name="mail.transport.protocol" value="smtp"/>
<!-- Change to the user who will receive mail -->
<property name="mail.user" value="XXX"/>
<!-- Change to the mail server -->
<property name="mail.pop3.host" value="localhost"/>
<!-- Change to the SMTP gateway server -->
<property name="mail.smtp.host" value="XXX"/>
<property name="mail.smtp.auth" value="true"></property>
<property name="mail.smtp.ssl.enable" value="false"></property>
<property name="mail.smtp.port" value="587"/>
<property name="mail.smtp.connectiontimeout" value="20000"></property>
<property name="mail.smtp.timeout" value="20000"></property>
<!-- The mail server port -->
<!-- Change to the address mail will be from -->
<property name="mail.from" value="XXX"/>
<!-- Enable debugging output from the javamail classes -->
<property name="mail.debug" value="true"/>
</configuration>
</attribute>
<depends>jboss:service=Naming</depends>
I'm intrested only in sending messages.
But still:
javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
nested exception is:
java.net.ConnectException: Connection refused
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1282)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:370)
at javax.mail.Service.connect(Service.java:275)
at javax.mail.Service.connect(Service.java:156)
at javax.mail.Service.connect(Service.java:105)
at javax.mail.Transport.send0(Transport.java:168)
at javax.mail.Transport.send(Transport.java:98)
<xxx>
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:529)
at java.net.Socket.connect(Socket.java:478)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:232)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1250)
... 59 more
Of course connection is refused because application is still pointed on localhost:25.
I have tried to find with grep other configurations, allocations, etc. mail-service is started (jmx-console info). Still its looked like aplication is not configured properly but using defaults.. Whats wrong?
PS: I'm not specialist in JBoss. I don't have root account on this hosting server.