Must issue a STARTTLS command first. Sending email with Java and Google Apps

问题

I am trying to use Bill the Lizard\'s code to send an email using Google Apps. I am getting this error:

Exception in thread \"main\" javax.mail.SendFailedException: Sending failed;
  nested exception is: 
    javax.mail.MessagingException: 530 5.7.0 Must issue a STARTTLS command first. f3sm9277120nfh.74

    at javax.mail.Transport.send0(Transport.java:219)
    at javax.mail.Transport.send(Transport.java:81)
    at SendMailUsingAuthentication.postMail(SendMailUsingAuthentication.java:81)
    at SendMailUsingAuthentication.main(SendMailUsingAuthentication.java:44)

Bill\'s code contains the next line, which seems related to the error:

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

However, it does not help.

These are my import statements:

import java.util.Properties; 
import javax.mail.Authenticator;
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;

Does anyone know about this error?

回答1:

I found the problem. Previously i was using j2ee.jar to import javax.mail.

I removed j2ee.jar from the classpath and downloaded JavaMail 1.4.1 and put into my classpath two jars, smtp.jar and mailapi.jar. I use now smtps instead smtp

Transport transport = session.getTransport("smtps");

Now Bill the Lizard's code works.

回答2:

Set the following tags. It will work.

props.put("mail.smtp.user","username"); 
props.put("mail.smtp.host", "smtp.gmail.com"); 
props.put("mail.smtp.port", "25"); 
props.put("mail.debug", "true"); 
props.put("mail.smtp.auth", "true"); 
props.put("mail.smtp.starttls.enable","true"); 
props.put("mail.smtp.EnableSSL.enable","true");

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

回答3:

It is the version of java mail API. I was facing this issue and I just updated the java mail API to 1.4.3 It works fine for me!

Thanks!

回答4:

I think it's got to do with using SMTPS instead of SMTP for mail transport. Here's a different version, modeled after the JavaMail FAQ on accessing Gmail. Note that I have left out all of the finer level exception handling for clarity.

private static void send(
        final String username,
        final String password,
        final String recipients,
        final String subject,
        final String body)
        throws Exception
{
    final Session session = Session.getInstance(System.getProperties(), null);
    final Message msg = new MimeMessage(session);
    final String senderEmail = username.contains("@") ? username : (username + "@gmail.com");
    msg.setFrom(new InternetAddress(senderEmail));

    final Address[] recipientAddresses = InternetAddress.parse(recipients);
    msg.setRecipients(Message.RecipientType.TO, recipientAddresses);

    msg.setSentDate(new Date());
    msg.setSubject(subject);
    msg.setText(body);

    final Transport transport = session.getTransport("smtps");
    transport.connect(GMAIL_SMTP_HOST, GMAIL_SMTP_PORT, username, password);
    transport.sendMessage(msg, recipientAddresses);
    transport.close();
}

回答5:

This was driving me crazy and so just wanted to add what worked for me. I had to update my version of JavaMail (1.4.5) for this to work - not sure what version was being used before.

Once I updated to new version of JavaMail, the following code worked for me (can uncomment the debug lines to get additional debugging info - port was 587 and host was smtp.gmail.com):

public void sendMailWithAuth(String host, String user, String password, 
    String port, List<String> toList, String htmlBody, 
        String subject) throws Exception {

    Properties props = System.getProperties();

    props.put("mail.smtp.user",user); 
    props.put("mail.smtp.password", password);
    props.put("mail.smtp.host", host); 
    props.put("mail.smtp.port", port); 
    //props.put("mail.debug", "true"); 
    props.put("mail.smtp.auth", "true"); 
    props.put("mail.smtp.starttls.enable","true"); 
    props.put("mail.smtp.EnableSSL.enable","true");

    Session session = Session.getInstance(props, null);
    //session.setDebug(true);

    MimeMessage message = new MimeMessage(session);
    message.setFrom(new InternetAddress(user));

    // To get the array of addresses
    for (String to: toList) {
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
    }

    message.setSubject(subject);
    message.setContent(htmlBody, "text/html");

    Transport transport = session.getTransport("smtp");
    try {
        transport.connect(host, user, password);
        transport.sendMessage(message, message.getAllRecipients());
    } finally {
        transport.close();
    }
}

回答6:

try this:

turn on: Allow less secure apps for your gmail account

https://myaccount.google.com/lesssecureapps

来源：https://stackoverflow.com/questions/386083/must-issue-a-starttls-command-first-sending-email-with-java-and-google-apps

标签

java

google-apps