JavaMail连接问题 [英] JavaMail connection problems

问题描述

我正在尝试测试一个在线发现的简单程序，以便使用JavaMail发送电子邮件。我试图使用工作电子邮件，但我收到错误无法连接到SMTP主机：...和权限被拒绝：连接。我已查看过有关此问题的其他帖子，包括：

JavaMail Exchange身份验证

使用JSP发送电子邮件

JavaMail API to iMail-java.net.SocketException：Permission denied：connect

<我认为我已经解决了那些基本上是IPv4问题和身份验证的帖子解决方案中提到的问题。我是尝试使用JavaMail的新手，所以我想知道我是否在制作其他初学者错误。还有其他我忽略的事情吗？我是否有可能以这种方式访问​​服务器？我使用的是通用名称，而不是我公司的实际名称。

代码如下：

  public static void main（String [] args）
 {
 System.setProperty（java.net.preferIPv4Stack，true）; 
 String host =mail.company.com; 
 final String user =[e-mail]; //相应地更改
 final String password =XXXXXXXX; //相应地更改
 
 String to =user @ company.com; //相应地更改
 
 //获取会话对象
属性props = new Properties（）; 
 props.put（mail.smtp.host，host）; 
 props.put（mail.smtp.auth，true）; 
 
会话session = Session.getDefaultInstance（props，new javax.mail.Authenticator（）
 {
 protected PasswordAuthentication getPasswordAuthentication（）
 {
 return new PasswordAuthentication（用户，密码）; 
} 
}）; 
 
 //撰写邮件
 try 
 {
 MimeMessage message = new MimeMessage（session）; 
 message.setFrom（new InternetAddress（user））; 
 message.addRecipient（Message.RecipientType.TO，new InternetAddress（to））; 
 message.setSubject（javatpoint）; 
 message.setText（这是使用JavaMail API发送电子邮件的简单程序）; 
 
 //发送消息
 Transport.send（message）; 
 
 System.out.println（消息发送成功...）; 
 
} 
 catch（MessagingException e）
 {
 e.printStackTrace（）; 
} 
} 
  

堆栈追踪：

  javax.mail.MessagingException：无法连接到SMTP主机：mail.company.com，port：25; 
嵌套异常是：
 java.net.SocketException：权限被拒绝：com.sun.mail.smtp.SMTPTransport.openServer（SMTPTransport.java:1706）
 at 
 com.sun.mail.smtp.SMTPTransport.protocolConnect（SMTPTransport.java:525）
 at javax.mail.Service.connect（Service.java:313）
 at javax.mail.Service.connect（ Service.java:172）
 at javax.mail.Service.connect（Service.java:121）
 at javax.mail.Transport.send0（Transport.java:190)
 at javax .mail.Transport.send（Transport.java:120）
 at mailtesting.SendMailBySite.main（SendMailBySite.java:45）
 
引起：java.net.SocketException：权限被拒绝：在java.net.TwoStacksPlainSocketImpl.socketConnect（本地方法）连接
 java.net.AbstractPlainSocketImpl.doConnect（未知来源）
 java.net.AbstractPlainSocketImpl.connectToAddress（未知来源）
 b $ b at java.net.AbstractPlainSocketImpl.connect（Unknown Source）
 at java.net.PlainSocketImpl.connect（Unknown Source）
 at java.net.So cksSocketImpl.connect（未知来源）
 at java.net.Socket.connect（Unknown Source）
 at java.net.Socket.connect（Unknown Source）
 at com.sun.mail。 util.SocketFetcher.createSocket（SocketFetcher.java:284）
 at com.sun.mail.util.SocketFetcher.getSocket（SocketFetcher.java:227）
 at com.sun.mail.smtp.SMTPTransport。 openServer（SMTPTransport.java:1672）
 ... 7更多
  

解决方案

java.net.SocketException：权限被拒绝：连接
  

这意味着您已连接到服务器和端口，服务器主动拒绝您的连接。

如果您尝试将 telnet 添加到此服务器和端口，您可能会获得更具描述性的消息，无论哪种方式，端口无法正常工作。

最有可能阻止端口 25 作为安全措施，这是大多数公司的相当标准设置。

由于您使用Outlook无法在设置中找到端口，我假设您正在连接到Exchange服务器，这可能是如果你的整个公司都是Microsoft Outlook商店，甚至根本没有启用 SMTP 。

你需要联系你的系统管理团队找出你应该实际使用的端口和协议。

I am trying to test a simple program found online to send an email using JavaMail. I am attempting to use a work email but I get an error "Could not connect to SMTP host:..." and "Permission denied: connect". I have looked through other posts on this issue including:

JavaMail Exchange Authentication

Sending email using JSP

JavaMail API to iMail -- java.net.SocketException: Permission denied: connect

I think I have addressed the problems mentioned in the solutions of those posts which are basically the IPv4 issue and the authentication. I am new to attempting to using JavaMail so I wonder if I am making some other beginner mistake. Are there any other things I am overlooking? Is it possible I just do not have access to the server in this manner? I have used generic names not the actual name of my company.

The code is below:

public static void main(String[] args) 
{   
    System.setProperty("java.net.preferIPv4Stack" , "true");
    String host="mail.company.com";   
    final String user="[e-mail]";//change accordingly   
    final String password="XXXXXXXX";//change accordingly   

    String to="[e-mail]";//change accordingly   

    //Get the session object   
    Properties props = new Properties();   
    props.put("mail.smtp.host",host);   
    props.put("mail.smtp.auth", "true");   

    Session session = Session.getDefaultInstance(props, new javax.mail.Authenticator() 
    {   
        protected PasswordAuthentication getPasswordAuthentication() 
        {   
            return new PasswordAuthentication(user,password);   
        }   
    });   

    //Compose the message   
    try 
    {   
        MimeMessage message = new MimeMessage(session);   
        message.setFrom(new InternetAddress(user));   
        message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));   
        message.setSubject("javatpoint");   
        message.setText("This is simple program of sending email using JavaMail API");   

        //send the message   
        Transport.send(message);   

        System.out.println("message sent successfully...");   

    } 
    catch (MessagingException e) 
    {
        e.printStackTrace();
    }
}

Stack Trace:

javax.mail.MessagingException: Could not connect to SMTP host: mail.company.com, port: 25;
nested exception is:
java.net.SocketException: Permission denied: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1706)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:525)
at javax.mail.Service.connect(Service.java:313)
at javax.mail.Service.connect(Service.java:172)
at javax.mail.Service.connect(Service.java:121)
at javax.mail.Transport.send0(Transport.java:190)
at javax.mail.Transport.send(Transport.java:120)
at mailtesting.SendMailBySite.main(SendMailBySite.java:45)

Caused by: java.net.SocketException: Permission denied: connect
at java.net.TwoStacksPlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:284)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:227)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1672)
... 7 more

解决方案

java.net.SocketException: Permission denied: connect

This means you connected to the server and port and the server actively denied your connection.

If you try and telnet to this server and port you might get a more descriptive message, either way, that port isn't going to work.

Most likely that port 25 is blocked as a security measure, this is pretty standard settings for most companies.

Since you are using Outlook can't find the port in the settings, I am assuming you are connecting to an Exchange server, which might not even have SMTP enabled at all if your entire company is a Microsoft Outlook shop.

You will need to contact your system admin team to find out what port and protocol you should actually be using.

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