Question

发送邮件时我收到此错误

java.lang.RuntimeException：javax.mail.SendFailedException：正在发送失败;嵌套异常是：class javax.mail.MessagingException：无法连接到SMTP主机：smtp.gmail.com，port：465，响应： -1

我的代码是：

Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.smtp.starttls.enable","true");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");

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

try {

        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("email"));
        message.setRecipients(Message.RecipientType.TO,
                        InternetAddress.parse(this.to));
        message.setSubject("Testing");
        message.setText("Hey, this is the testing email.");



        Transport.send(message);

任何帮助都将不胜感激。

先谢谢。

Answer 1

您需要告诉它您正在使用SSL：

props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");

万一你错过了什么，这里有工作代码：

String  d_email = "address@gmail.com",
            d_uname = "Name",
            d_password = "urpassword",
            d_host = "smtp.gmail.com",
            d_port  = "465",
            m_to = "toAddress@gmail.com",
            m_subject = "Indoors Readable File: " + params[0].getName(),
            m_text = "This message is from Indoor Positioning App. Required file(s) are attached.";
    Properties 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");

    SMTPAuthenticator auth = new SMTPAuthenticator();
    Session session = Session.getInstance(props, auth);
    session.setDebug(true);

    MimeMessage msg = new MimeMessage(session);
    try {
        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, Integer.valueOf(d_port), d_uname, d_password);
            transport.sendMessage(msg, msg.getAllRecipients());
            transport.close();

        } catch (AddressException e) {
            e.printStackTrace();
            return false;
        } catch (MessagingException e) {
            e.printStackTrace();
            return false;
        }

Answer 2

在使用NetBeans进行调试时，我遇到过这个问题，甚至执行实际的jar文件。防病毒软件会阻止发送电子邮件。您应该在调试期间暂时禁用防病毒软件，或者排除NetBeans并扫描实际的jar文件。就我而言，我正在使用Avast。

请参阅此链接，了解如何排除：How to Add File/Website Exception into avast! Antivirus 2014

它对我有用。

Answer 3

我所做的是我评论了

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

因为显然对于G-mail你不需要它。然后，如果您还没有这样做，则需要在G-mail中为您的程序创建一个应用程序密码。我做到了，效果很好。此链接将向您展示如何：https://support.google.com/accounts/answer/185833。

Answer 4

端口465用于“smtp over SSL”。

http://javamail.kenai.com/nonav/javadocs/com/sun/mail/smtp/package-summary.html

[...] For example, use
    props.put("mail.smtp.port", "888");
to set the mail.smtp.port property, which is of type int.

Note that if you're using the "smtps" protocol to access SMTP over SSL, 
all the properties would be named "mail.smtps.*"

Answer 5

就我而言，这是Avast Antivirus干扰了连接。禁用此功能的操作： Avast->设置->组件-> Mail Shield（自定义）-> SSL扫描->取消选中“扫描SSL连接”。

无法连接到SMTP主机：smtp.gmail.com，port：465，响应：-1

5 个答案: