smtpProtocol.connect("127.0.0.1", m_smtpListenerPort);
// no message there, yet
assertNull("no mail received by mail server", m_mailServer.getLastMail());
smtpProtocol.helo(InetAddress.getLocalHost().toString());
smtpProtocol.setSender("mail@localhost");
smtpProtocol.addRecipient("mail@localhost");