通过gmail发送电子邮件的属性 [英] Properties for Sending email via gmail

问题描述

我目前正在编写一个简单的程序，以通过gmail向gmail帐户发送电子邮件. 尝试了各种方法，但通常我最终遇到相同的错误，无法连接到SMTP主机:smtp.gmail.com，端口:587;"

I'm currently inline of writing a simple program to send email via gmail to a gmail account. Have tried various ways but often i'm ending up on the same error, "Could not connect to SMTP host: smtp.gmail.com, port: 587;"

是否与属性设置有关.这是我程序中的片段.寻找解决方案:)

Whether it has got anything to do with properties settings. Here is the snippet from my program. Looking for a solution :)

预先感谢

public static boolean SendMail(String from, String password, String message, String to[]){
        String host = "smtp.gmail.com";
        Properties prop = System.getProperties();
        prop.put("mail.smtp.starttls.enable", "true");
        prop.put("mail.smtp.host", host);
        prop.put("mail.smtp.user", from);
        prop.put("mail.smtp.password", password);
        prop.put("mail.smtp.port", 587); //prop.put("mail.smtp.port", 465);//
        prop.put("mail.smtp.auth", "true");

         // check for the first value in the name of props or prop
        Session session = Session.getDefaultInstance(prop, null);
        MimeMessage mimemsg = new MimeMessage(session);

        try{
            mimemsg.setFrom(new InternetAddress(from));

            // Get reciepents Address
            InternetAddress[] toAddress = new InternetAddress[to.length];
            for (int i=0;i<to.length;i++){
                toAddress[i] = new InternetAddress(to[i]);
            }

            //Add all toAddress to mimemessage
            for(int j=0;j<toAddress.length;j++){
                mimemsg.addRecipient(RecipientType.TO, toAddress[j]);

            }

            // Add Subject.
            mimemsg.setSubject(" MAIL from JAVA Program");
            // Add Message to the content(input to the method )
            mimemsg.setText(message);

            Transport trans = session.getTransport("smtp");
            trans.connect(host,from,password);
            trans.sendMessage(mimemsg, mimemsg.getAllRecipients());
            trans.close();
            return true;

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


    return false;
}

推荐答案

您的设置似乎正确.对于TLS，GMail SMTP端口为 587 .这看起来像是网络连接问题(主机名无法解决).

Your settings seem correct. GMail SMTP port is 587 for TLS. This looks like a network connectivity issue (the hostname does not resolve).

• 再次检查您的登录凭据.
• 尝试从同一框中输入telnet smtp.gmail.com 587.您收到SMTP问候了吗?
• 尝试直接使用IP地址. 警告:除了故障排除之外，您不应使用直接IP.它随时可能发生变化，并且使您的代码无用.

• Double check your login credentials.
• Try to telnet smtp.gmail.com 587 from the same box. Are you getting the SMTP greeting?
• Try to directly use an IP address. Caution: you should not use a direct IP except for troubleshooting. It is bound to change at any time and render your code useless.

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