Question

我已经看到了有关此问题的所有问题和答案，已经阅读了常见问题解答，并尝试了所有发现的解决方案，除了编写自己的解决方案之外，我关闭了安全性较低的应用程序Gmail等。我已经检查了telnet连接，当然，尝试ping smtp.gmail.com ，并且一切正常。甚至我已经（肯定）用C＃编写了一个小应用程序，这花了我5分钟的时间（这确实可行！）。请给我一个提示，我该如何解决这个问题。对于使用ttl或ssl的每个解决方案，我都会得到此stacktrace

    com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 587; timeout -1;
  nested exception is:
    java.net.ConnectException: Connection refused: connect
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2209)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:740)
    at javax.mail.Service.connect(Service.java:366)
    at javax.mail.Service.connect(Service.java:246)
    at com.luga.culturalpickup.UsableSendMail.sendFromGMail(UsableSendMail.java:64)
    at com.luga.culturalpickup.UsableSendMail.main(UsableSendMail.java:84)
Caused by: java.net.ConnectException: Connection refused: 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:359)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:238)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2175)
    ... 5 more

我已完全禁用防火墙。

即使我已经在JavaMail Api周围使用了一些包装器来发送信件，但内部却因这种异常而掉线！

我想使用Java发送小型电子邮件！

例如，此代码产生上面指定的错误

public class GoogleTest {

    private static final String SMTP_HOST_NAME = "smtp.gmail.com";
    private static final String SMTP_PORT = "465";
    private static final String emailMsgTxt = "Test Message Contents";
    private static final String emailSubjectTxt = "A test from gmail";
    private static final String emailFromAddress = "mail4@gmail.com";
    private static final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
    private static final String[] sendTo = { "alex.95@mail.ru" };


    public static void main(String args[]) throws Exception {

        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());

        new GoogleTest().sendSSLMessage(sendTo, emailSubjectTxt,
                emailMsgTxt, emailFromAddress);
        System.out.println("Sucessfully mail to All Users");
    }

    public void sendSSLMessage(String recipients[], String subject,
                               String message, String from) throws MessagingException {
        boolean debug = true;

        Properties props = new Properties();
        props.put("mail.smtp.host", SMTP_HOST_NAME);
        props.put("mail.smtp.auth", "true");
        props.put("mail.debug", "true");
        props.put("mail.smtp.port", SMTP_PORT);
        props.put("mail.smtp.socketFactory.port", SMTP_PORT);
        props.put("mail.smtp.socketFactory.class", SSL_FACTORY);
        props.put("mail.smtp.socketFactory.fallback", "false");

        Session session = Session.getDefaultInstance(props,
                new javax.mail.Authenticator() {
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication("mail4@gmail.com", "password");
                    }
                });

        session.setDebug(debug);

        Message msg = new MimeMessage(session);
        InternetAddress addressFrom = new InternetAddress(from);
        msg.setFrom(addressFrom);

        InternetAddress[] addressTo = new InternetAddress[recipients.length];
        for (int i = 0; i < recipients.length; i++) {
            addressTo[i] = new InternetAddress(recipients[i]);
        }
        msg.setRecipients(Message.RecipientType.TO, addressTo);

        // Setting the Subject and Content Type
        msg.setSubject(subject);
        msg.setContent(message, "text/plain");
        Transport.send(msg);
    }
}

我遵循了堆栈跟踪

    DEBUG: JavaMail version 1.6.2
DEBUG: successfully loaded resource: /META-INF/javamail.default.address.map
DEBUG: setDebug: JavaMail version 1.6.2
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Oracle]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp.gmail.com", port 465, isSSL true
Exception in thread "main" com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 465; timeout -1;
  nested exception is:
    java.net.ConnectException: Connection refused: connect
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2209)
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:740)
    at javax.mail.Service.connect(Service.java:366)
    at javax.mail.Service.connect(Service.java:246)
    at javax.mail.Service.connect(Service.java:267)
    at javax.mail.Transport.send0(Transport.java:252)
    at javax.mail.Transport.send(Transport.java:174)
    at com.luga.culturalpickup.GoogleTest.sendSSLMessage(GoogleTest.java:72)
    at com.luga.culturalpickup.GoogleTest.main(GoogleTest.java:29)
Caused by: java.net.ConnectException: Connection refused: 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:359)
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:217)
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2175)
    ... 8 more

Answer 1

配置详细信息对我来说不错。

最大的提示是您收到“拒绝连接”消息。从理论上讲，对此有一些可能的解释：

smtp.gmail.com服务器全部关闭。这是高度可能性很小。
smtp.gmail.com服务器可能已将您的IP地址或包含您的IP地址的网络范围列入黑名单。（也许gmail.com服务器通过您的ISP收到的垃圾邮件过多。）
也许全国范围内的电子邮件封锁。（例如，it has been claimed中国有时会这样做。）
也许ISP阻止了这些端口上与smtp.gmail.com的连接……或该端口上的所有出站连接。这样做可以防止ISP的客户发送垃圾邮件。检查您的ISP关于发送电子邮件的条款和条件，并检查有关应该如何执行操作的信息。
也许您的组织正在阻止与smtp.gmail.com的连接。可以这样做，以便他们可以监视所有外发电子邮件。也可以这样做以防止垃圾邮件或可解释为垃圾邮件的行为。与您当地的IT和网络经理联系。
也许这是您计算机的内部防火墙。（尽管您说您禁用了它...）

您可以执行一个简单的测试来验证这一点。使用“ telnet”命令尝试在这两个端口上连接到smtp.gmail.com。如果收到“连接被拒绝”，则有力的证据表明某处存在某种阻塞。

最后，如果端口似乎已打开，请对照此教程页面检查您正在做什么：

https://www.mkyong.com/java/javamail-api-sending-email-via-gmail-smtp-example/

Answer 2

一天半后，我发现了一个问题。这是由于avg防病毒软件或更确切地说是avg病毒。它已关闭（如他向我展示的那样），但是我注意到在用C＃编写的应用程序发送的消息上附加了一些平均广告，我找到了一种将其关闭的方法！现在就可以了！

JavaMail API不适用于我，但出现了com.sun.mail.util.MailConnectException异常：无法连接到主机，端口

2 个答案: