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

java groovy smtp gmail jakarta-mail

2022-09-01 08:41:59

我正在尝试在时髦的脚本中使用javamail通过gmail发送电子邮件。我在网上找了很多地方，但到目前为止一直无法让它工作。运行脚本时遇到的错误是：

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，即使我已经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使用具有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，这不是端口被阻止或连接问题。以下是我用来尝试发送电子邮件的代码：

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！

-布莱恩

答案 1

在Java中，你会做类似的事情：

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，在现代 JVM 中，socketFactory 属性不再是必需的，但对于 Gmail，您可能需要将 'mail.smtps.auth' 和 'mail.smtps.starttls.enable' 设置为 'true'。“mail.smtps.debug”也可能有所帮助。

答案 2

对于任何寻找完整解决方案的人来说，我根据maximdim的答案使用以下代码：

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

private class SMTPAuthenticator extends Authenticator
{
    public PasswordAuthentication getPasswordAuthentication()
    {
        return new PasswordAuthentication('email@gmail.com', 'test1234');
    }
}

def  d_email = "email@gmail.com",
        d_uname = "email",
        d_password = "password",
        d_host = "smtp.gmail.com",
        d_port  = "465", //465,587
        m_to = "testepscript@gmail.com",
        m_subject = "Testing",
        m_text = "Hey, this is the testing email."

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 transport = session.getTransport("smtps");
transport.connect(d_host, 465, d_uname, d_password);
transport.sendMessage(msg, msg.getAllRecipients());
transport.close();