使用Javamail连接到Gmail smtp服务器会忽略指定的端口并尝试使用25

我试图在groovy脚本中使用javamail通过gmail发送一封电子邮件。我在网上查了很多地方，到目前为止一直无法工作。我在运行脚本时遇到的错误是：

I'm trying to use javamail in a groovy script to send out an email via gmail. I've looked many places online and have been unable to get it working thus far. The error I'm getting when running my script is:

DEBUG SMTP: useEhlo true, useAuth false
DEBUG SMTP: trying to connect to host "smtp.gmail.com", port 25, isSSL false
Caught: javax.mail.SendFailedException: Send failure (javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 25 (javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?))

它似乎试图使用端口25，即使我已经指定它应该使用端口587.有谁知道什么可能导致此问题，我已经使用telnet连接到端口587 smtp服务器，并且thunderbird使用带有STARTTLS安全性的端口587，并且能够使用smtp服务器成功发送邮件。这告诉我，它不是一个阻塞的端口或连接问题。这里是我用来尝试发送电子邮件的代码：

It appears to be trying to use port 25 even though I've specified that it should use port 587. Does anyone know what could be causing this problem, I've used telnet to connect to the smtp server on port 587, and thunderbird uses port 587 with STARTTLS security and is able to successfully send mail using the smtp server. This tells me that it is not a blocked port or connectivity issue. Here is the code I'm using to try and send the email:

import javax.mail.*
import javax.mail.internet.*

private class SMTPAuthenticator extends Authenticator
{
    public PasswordAuthentication getPasswordAuthentication()
    {
        return new PasswordAuthentication('email@gmail.com', 'password');
    }
}

def  d_email = "email@gmail.com",
        d_password = "password",
        d_host = "smtp.gmail.com",
        d_port  = "587", //465,587
        m_to = "email@gmail.com",
        m_subject = "Testing",
        m_text = "This is a test."

def props = new Properties()
props.put("mail.smtp.user", d_email)
props.put("mail.smtp.host", d_host)
props.put("mail.smtp.port", d_port)
props.put("mail.smtp.starttls.enable","true")
props.put("mail.smtp.debug", "true");
props.put("mail.smtp.auth", "true")
props.put("mail.smtp.socketFactory.port", d_port)
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory")
props.put("mail.smtp.socketFactory.fallback", "false")

def auth = new SMTPAuthenticator()
def session = Session.getInstance(props, auth)
session.setDebug(true);

def msg = new MimeMessage(session)
msg.setText(m_text)
msg.setSubject(m_subject)
msg.setFrom(new InternetAddress(d_email))
msg.addRecipient(Message.RecipientType.TO, new InternetAddress(m_to))
Transport.send(msg)

任何帮助将不胜感激。提前感谢！

Any help would be greatly appreciated. Thanks in advance!

-Bryan