com.sun.mail.util.MailConnect异常：无法连接到主机，端口：smtp.gmail.com，587 超时 -1

Question

错误：

com.sun.mail.util.MailConnectException无法连接到主机、端口smtp.gmail.com，587超时-1嵌套异常为java.net.ConnectException：连接被拒绝：连接

我的源代码是：

package poidemo;
import java.util.Properties;    
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class Test_MailTrigger {
public static void main(String [] args) {
String to = "[e-mail]";//change accordingly    
String from = "[e-mail]";//change accordingly
final String username = "[e-mail]";//change accordingly
final String password = "*****";//change accordingly    
String host = "smtp.gmail.com";    
Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", host);
props.put("mail.smtp.port", 587);    
Session session = Session.getInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password);
}
});    
try {
Message message = new MimeMessage(session);    
message.setFrom(new InternetAddress(from));    
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(to));    
message.setSubject("Testing Subject");    
message.setText("Hello, this is sample for to check send "
+ "email using JavaMailAPI ");    
Transport.send(message);    
System.out.println("Sent message successfully....");    
} catch (MessagingException e) {
System.out.println(e);
}          
}
}

Answer 1

尝试另一个端口：465并添加更多道具

props.put("mail.smtp.port", "465");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.socketFactory.fallback", "false");