* under the alias matched by {@link RunMojo#serverName}.
*
* @return The server object that starts and stops the mail server(s).
*/
private MailServer createServer() {
final ServerFactoryLocator locator = ServerFactoryLocator
.getInstance(this);
final ServerFactory factory = locator.getFactory(serverName);
MailServer server;
if (factory == null) {
server = null;
} else {
server = (MailServer)factory.createServer();