[英]How do I fix a javax.mail.MessagingException when using SMTP through GMail?
I cannot execute code that is publicly available for sending email through Gmail. 我无法执行公开用于通过Gmail发送电子邮件的代码。 I think it may be a network problem because I am at work although I am able to ping Gmail through the cmd
prompt: ping smtp.gmail.com
. 我认为这可能是网络问题,因为尽管我可以在cmd
提示符下ping Gmail: ping smtp.gmail.com
但我ping smtp.gmail.com
。
Here is the code I am using (from this page ): 这是我正在使用的代码(来自此页面 ):
import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;
class tester {
public static void main(String args[]) {
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
props.put("mail.stmp.user", "username of the sender");
//If you want you use TLS
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.password", "password of the sender");
// If you want to use SSL
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
Session session = Session.getDefaultInstance(props, new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
String username = "username";
String password = "password";
return new PasswordAuthentication("username","password");
}
});
String to = "me@gmail.com";
String from = "from@gmail.com";
String subject = "Testing...";
MimeMessage msg = new MimeMessage(session);
try {
msg.setFrom(new InternetAddress(from));
msg.setRecipient(MimeMessage.RecipientType.TO, new InternetAddress(to));
msg.setSubject(subject);
msg.setText("JAVA is the BEST");
Transport transport = session.getTransport("smtp");
transport.send(msg);
System.out.println("E-mail sent !");
} catch(Exception exc) {
System.out.println(exc);
}
}
}
I have changed the username and password fields to be correct. 我已更改用户名和密码字段为正确的。 What are some things that could cause this? 有哪些可能导致此问题的原因? I have used my own code and many other publicly available code for this, but I get the same error. 我为此使用了自己的代码和许多其他公共可用的代码,但是遇到了相同的错误。 I did try running through port 587 also and received the same error. 我也尝试通过端口587运行,并收到了相同的错误。
Here is the error: 这是错误:
javax.mail.MessagingException: Could not connect to SMTP host: smtp.gmail.com, port: 465;
nested exception is: java.net.ConnectException: Connection refused: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1961)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:654)
at javax.mail.Service.connect(Service.java:317)
at javax.mail.Service.connect(Service.java:176)
at javax.mail.Service.connect(Service.java:125)
at javax.mail.Transport.send0(Transport.java:194)
at javax.mail.Transport.send(Transport.java:124)
at GoogleMail.sendMail(GoogleMail.java:45)
I used the telnet smtp.gmail.com 465
and telnet smtp.gmail.com 587
command in the cmd
prompt and both could not connect. 我在cmd
提示符下使用了telnet smtp.gmail.com 465
和telnet smtp.gmail.com 587
命令,但都无法连接。 I assume it is associated with the network I am connected to. 我认为它与我连接的网络相关。 I cannot provide any info beyond this and will update if I find out more. 除此以外,我无法提供任何信息,如果我发现更多信息,将会更新。
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