JavaMail STARTTLS Error?

Question

我有以下代码：

import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.PasswordAuthentication;
public class Alpha{
public static void main (String[] args){
    final String username = "[e-mail]";
    final String password = "mypassword";
    Properties props = new Properties();
    props.put("mail.smtp.auth", "true");
    props.put("mail.smpt.starttls.enable", "true");
    props.put("mail.smtp.host", "smtp.gmail.com");
    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("[e-mail]"));
        message.setRecipients(Message.RecipientType.TO,
            InternetAddress.parse("[e-mail]"));
        message.setSubject("Test Email");
        message.setText("Message");
        Transport.send(message);
        System.out.println("The message was sent");

        } catch (MessagingException e){
            throw new RuntimeException(e);
    }

}

}

但是不断收到此错误：

Exception in thread "main" java.lang.RuntimeException: com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first. p3sm47032789wjf.49 - gsmtp
at Alpha.main(Alpha.java:46)
Caused by: com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first. p3sm47032789wjf.49 - gsmtp
at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2108)
at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1609)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1117)
at javax.mail.Transport.send0(Transport.java:195)
at javax.mail.Transport.send(Transport.java:124)
at Alpha.main(Alpha.java:40)

我环顾四周，找到了类似问题的答案，上面写着：props.put（"mail.smpt.starttls.enable"， "true"）;，但它仍然不起作用，我不知道该怎么办！

Answer 1

属性名称中有拼写错误：

mail.smtp.starttls.enable

而不是

mail.smpt.starttls.enable