在 Netbeans 中发送电子邮件抛出错误：收到致命警报：协议版本

Question

我有这个在 Eclipse 中运行良好的 Java 程序，它使用 Apache commons 邮件库 1.4 发送电子邮件：

import org.apache.commons.mail.*;

public class SendEmail {

    public static void main(String[] args) throws EmailException {

            HtmlEmail email2 = new HtmlEmail();
            email2.setHostName("smtp.ionos.com");
            email2.setAuthentication("[email protected]", "abc123");
            email2.setFrom("[email protected]", "Jon Doe");
            email2.setSSLOnConnect(true);
            email2.setSubject("this is the subject");
            email2.setHtmlMsg("<h1>HELLO WORLD NOW WORKS !!! </h1>");
            email2.addTo("[email protected]", "Julius Cesar");
            System.setProperty("https.protocols", "TLSv1.2,TLSv1.3");
            email2.send();
            System.out.println("EMAIL SENT !!!!");

    }
}

当我在 Netbeans 中运行 same 程序时，出现错误

email2.send()

:

Caused by: javax.mail.MessagingException: Could not connect to SMTP host: smtp.ionos.com, port: 465;
  nested exception is:
    javax.net.ssl.SSLHandshakeException: Received fatal alert: protocol_version

Eclipse 和 Netbeans 都运行 Java 15.0.2。 Eclipse 和 Netbeans 有什么区别？如何解决这个问题？