apache-commons-email 群发邮件时 只显示一个收件人?

Question

1.相关代码：
public static void sendSSLMessage(String hostName, int port, String username, String password, String subject, String massage, String ... to) throws EmailException {

    Email email = new SimpleEmail();
    email.setCharset("UTF-8");
    email.setHostName(hostName);
    email.setSmtpPort(port);
    email.setSSLOnConnect(true);
    email.setAuthenticator(new DefaultAuthenticator(username, password));
    email.setFrom(username);
    email.addTo(to);
    email.setSubject(subject);
    email.setMsg(massage);
    email.send();
}

2.截图：
3.有多个收件人，只显示一个，163邮箱能显示多个，阿里企业邮箱只显示一个