Question

我尝试使用javax.mail API在Windows 8.1上使用java 1.8发送电子邮件，但我一直收到错误消息。

这是我写的方法：

public void sendAlertMail(String from, String to, String header, String msgBody){
        Properties props = new Properties();
        props.put("mail.transport.protocol", "smtp");
        props.put("mail.smtp.host", smptHost);
        props.put("mail.smtp.port", smptPort);
        props.put("mail.smtp.starttls","true");
        Session mailSession;
        if (authenticate) {
            props.put("mail.smtp.auth", "true");

            Authenticator auth = new SMTPAuthenticator();
            mailSession = Session.getInstance(props, auth);
        }
        else{
            mailSession = Session.getInstance(props);
        }
        // uncomment for debugging infos to stdout
        // mailSession.setDebug(true);
        Transport transport = null;
        try {
            transport = mailSession.getTransport();
        } catch (NoSuchProviderException e) {
            e.printStackTrace();
        }

        MimeMessage message = new MimeMessage(mailSession);
        try {
            message.addHeaderLine(header);
            message.setContent(msgBody, "text/plain");
            message.setFrom(new InternetAddress(from));
            message.addRecipient(Message.RecipientType.TO,
                    new InternetAddress(to));
        } catch (MessagingException e) {
        }
        try {
            transport.connect();
            transport.sendMessage(message,
                    message.getRecipients(Message.RecipientType.TO));
            transport.close();
        } catch (MessagingException e) {
            e.printStackTrace();
        }
    }

我收到的错误是：

com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 587; timeout -1;
  nested exception is:
    java.net.SocketException: Permission denied: connect
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2100)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:699)
    at javax.mail.Service.connect(Service.java:388)
    at javax.mail.Service.connect(Service.java:246)
    at javax.mail.Service.connect(Service.java:195)
    at tapperSolution.mail.MailSender.sendAlertMail(MailSender.java:64)
    at tapperSolution.mail.MailSender.sendAlertMail(MailSender.java:74)
    at tapperSolution.mail.MailSender.main(MailSender.java:88)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: java.net.SocketException: Permission denied: connect\at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at java.net.Socket.connect(Socket.java:538)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:331)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:238)
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2066)
... 12 more

我关闭了防火墙和防病毒软件，并尝试使用以下代码在我的代码中设置VM选项：

System.setProperty("java.net.preferIPv4Stack", "true");

还尝试使用以下命令在运行命令中设置它：

-Djava.net.preferIPv4stack =真

我能够使用Python发送邮件，但我想使用Java来发送邮件。

尝试使用Wireshark捕获流量，但服务器甚至没有TCP握手。

还有其他想法吗？

由于

Answer 1

看起来您的SMTP服务器可能拒绝您的连接，可能是由于身份验证问题。要对此进行测试，请在同一台计算机上尝试manual SMTP session，然后查看结果。

无法使用Javax.mail发送Mail

1 个答案: