public static void main(String[] args) {
// Configure/Authenticate the Dyn Java Messaging client instance
ProviderMetadata meta = Providers.withId("dyn-messaging");
ContextBuilder ctx = ContextBuilder.newBuilder(meta);
ctx.credentials(/* intentionally blank -> */"", "yourapikey");
DynMessagingApi dyn = ctx.buildApi(DynMessagingApi.class);
SendMailApi send = dyn.getSendMailApi();
System.out.println("send : "
+ send.sendMessage("fromperson@example.org",