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

Using Javamail to connect to Gmail smtp server ignores specified port and tries to use 25(使用 Javamail 连接到 Gmail smtp 服务器会忽略指定端口并尝试使用 25)

问题描述

我正在尝试在 groovy 脚本中使用 javamail 通过 gmail 发送电子邮件.我在网上看了很多地方，但到目前为止一直无法正常工作.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?))

它似乎正在尝试使用端口 25，即使我已指定它应该使用端口 587.有谁知道可能导致此问题的原因，我使用 telnet 连接到端口 587 上的 smtp 服务器，Thunderbird 使用 587 端口和 STARTTLS 安全，并且能够使用 smtp 服务器成功发送邮件.这告诉我这不是阻塞的端口或连接问题.这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.提前致谢！

Any help would be greatly appreciated. Thanks in advance!

-布莱恩

推荐答案

在 Java 中你会做类似的事情:

In Java you would do something similar to:

Transport transport = session.getTransport("smtps");
transport.connect (smtp_host, smtp_port, smtp_username, smtp_password);
transport.sendMessage(msg, msg.getAllRecipients());
transport.close();    

注意smtpS"协议.此外，现代 JVM 中不再需要 socketFactory 属性，但您可能需要将 Gmail 的mail.smtps.auth"和mail.smtps.starttls.enable"设置为true".'mail.smtps.debug' 也会有帮助.

Note 'smtpS' protocol. Also socketFactory properties is no longer necessary in modern JVMs but you might need to set 'mail.smtps.auth' and 'mail.smtps.starttls.enable' to 'true' for Gmail. 'mail.smtps.debug' could be helpful too.

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