Problemas para enviar e-mail pelo Java

package testeenvioemail;

import org.apache.commons.mail.EmailException;
import org.apache.commons.mail.SimpleEmail;

public class TesteEnvioEmail {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws EmailException {
        // TODO code application logic here
        System.out.println("Testando envio de e-mail");
        SimpleEmail email = new SimpleEmail();
        //Utilize o hostname do seu provedor de email
        System.out.println("alterando hostname...");
        email.setHostName("srbs00006.zf-lenksysteme.net");
        email.setSmtpPort(587);
        email.setSslSmtpPort("587");
        //Adicione os destinatários
        email.addTo("lucas.stramandinoli@...", "Lucas");
        //Configure o seu email do qual enviará
        email.setFrom("alexandre.cardoso@...", "Alexandre");
        //Adicione um assunto
        email.setSubject("Teste messagem");
        //Adicione a mensagem do email
        email.setMsg("This is a simple test of commons-email");
        //Para autenticar no servidor é necessário chamar os dois métodos abaixo
        System.out.println("autenticando...");
        email.setSSL(true);
        email.setAuthentication("user", "*******");
        System.out.println("enviando...");
        email.setDebug(true);
        email.send();
        System.out.println("Email enviado!");
    }
}

E o erro…

Exception in thread “main” org.apache.commons.mail.EmailException: Sending the email to the following server failed : <a href="http://srbs00006.zf-lenksysteme.net:587">srbs00006.zf-lenksysteme.net:587</a>

at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1242)

at org.apache.commons.mail.Email.send(Email.java:1267)

at testeenvioemail.TesteEnvioEmail.main(TesteEnvioEmail.java:42)

Caused by: javax.mail.MessagingException: Could not connect to SMTP host: <a href="http://srbs00006.zf-lenksysteme.net">srbs00006.zf-lenksysteme.net</a>, port: 587;

nested exception is:

java.net.ConnectException: Connection refused: connect

at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1972)

at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:642)

at javax.mail.Service.connect(Service.java:317)

at javax.mail.Service.connect(Service.java:176)

at javax.mail.Service.connect(Service.java:125)

at javax.mail.Transport.send0(Transport.java:194)

at javax.mail.Transport.send(Transport.java:124)

at org.apache.commons.mail.Email.sendMimeMessage(Email.java:1232)

… 2 more

Caused by: java.net.ConnectException: Connection refused: connect

at java.net.PlainSocketImpl.socketConnect(Native Method)

at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)

at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)

at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)

at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)

at java.net.Socket.connect(Socket.java:529)

at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:550)

at com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:141)

at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:319)

at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:207)

at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1938)

… 9 more

Java Result: 1