facebook:为什么我不能从应用程序向用户发送电子邮件?

我正在使用java库,尽管我认为它与此无关。

long uid = ...;
Collection<Long> uids = new ArrayList<Long>();
uids.add(uid);
FacebookXmlRestClient client = new FacebookXmlRestClient(api, secret);
boolean sendEmailPerm = client.users_hasAppPermission(Permission.EMAIL,uid);
System.out.println("Can send email: "+ sendEmailPerm);
Collection<String> sent = client.notifications_sendTextEmail(uids, "subject", "body");
System.out.println("Succesfully sent email to: "+sent);
sent = client.notifications_sendFbmlEmail(uids, "subject", "body");
System.out.println("Succesfully sent email to: "+sent);

我正在尝试fbml和文本电子邮件。我也可以获得用户的代理电子邮件属性,但当我发送电子邮件到该地址与我的常规邮件客户端是没有到达。

输出为:

Can send email: true
Succesfully sent email to: []
Succesfully sent email to: []