使用TSL通过SMTP发送电子邮件 [英] Sending emails over SMTP with TSL

问题描述

以下发布的代码对我来说可以通过带有SSL的STMP发送电子邮件。
现在SMTP更改为TSL，我不会设法发送电子邮件。
我尝试过几个东西，比如添加

The code posted below works fine for me to send an email over an STMP with SSL. Now the SMTP changed to TSL and i dont manage to send email with it. I tried several things like adding

props.put("mail.smtp.starttls.enable","true");

但没有用。

错误代码说：

javax.mail.MessagingException：无法连接到SMTP主机：exch.studi.fhws.de，port：587;
嵌套异常是：
javax.net.ssl.SSLException：无法识别的SSL消息，纯文本连接？

"javax.mail.MessagingException: Could not connect to SMTP host: exch.studi.fhws.de, port: 587; nested exception is: javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection?"

任何想法？

import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;

public class SendMail
{
String d_email = "...",
password = "...",
host = "...",
port = "25",
mailTo = "...",
mailSubject = "test",
mailText = "test";

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

    SecurityManager security = System.getSecurityManager();

    try
    {
        Authenticator auth = new SMTPAuthenticator();
        Session session = Session.getInstance(props, auth);

        MimeMessage msg = new MimeMessage(session);
        msg.setText(mailText);
        msg.setSubject(mailSubject);
        msg.setFrom(new InternetAddress(d_email));
        msg.addRecipient(Message.RecipientType.TO, new InternetAddress(mailTo));
        Transport.send(msg);
    }
    catch (Exception mex)
    {
        mex.printStackTrace();
    }
}

public static void main(String[] args)
{
    TextClass tc = new TextClass();
}

private class SMTPAuthenticator extends javax.mail.Authenticator
{
    public PasswordAuthentication getPasswordAuthentication()
    {
        return new PasswordAuthentication(d_email, password);
    }
}
}

推荐答案

也许这个答案谈到禁用SMTP端口的Exchange服务器是有用的： https://stackoverflow.com/a/ 12631772/187148

Maybe this answer, talking about Exchange servers with SMTP ports disabled, is useful: https://stackoverflow.com/a/12631772/187148

这篇关于使用TSL通过SMTP发送电子邮件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！