@Override
protected void setUpSMTPServer() throws Exception {
SimpleLog log = new SimpleLog("SMTP");
log.setLevel(SimpleLog.LOG_LEVEL_ALL);
m_smtpServer = new SMTPServer();
m_smtpServer.setDNSService(m_dnsServer);
m_smtpServer.setFileSystem(fileSystem);
m_smtpServer.setProtocolHandlerChain(chain);