我得到 530 5.7.0 必须先发出 STARTTLS 命令。a5sm29349940pbw.4 - 从java程序发送邮件时gsmtp错误，如何解决？

i am getting 530 5.7.0 Must issue a STARTTLS command first. a5sm29349940pbw.4 - gsmtp error while send a mail from java program, how to solve it?

提问by wadjikars

Error:

错误：

com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.0 Must issue a STARTTLS command first. a5sm29349940pbw.4 - gsmtp

at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1829)
at com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1368)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:886)
at javax.mail.Transport.send0(Transport.java:191)
at javax.mail.Transport.send(Transport.java:120)
at com.conceptbuild.EmailGenerator.main(EmailGenerator.java:120)

Code:

代码：

package com.conceptbuild;

import java.io.UnsupportedEncodingException;
import java.util.Date;
import java.util.Properties;
import javax.mail.Address;
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.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMessage.RecipientType;

public class EmailGenerator {

    public EmailGenerator() {
        // TODO Auto-generated constructor stub
    }

    private class MailAuthenticator extends Authenticator {

        String username = "username";

        String password = "password";

        public MailAuthenticator() {
            // TODO Auto-generated constructor stub
        }

        protected PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(username, password);
        }

    }

    public static void main(String[] args)   {

        String host="smtp.gmail.com";
        String from="fromaddress";
        String to="toaddress";
        String cc="ccaddress";
        Address fromaddress=null,toaddress=null,ccaddress=null;

        Properties mailproperties= new Properties();

        mailproperties.put("mail.smtp.host", host);
        mailproperties.put("mail.smtp.port", 25);
        mailproperties.put("mail.debug", "true");
        mailproperties.put("mail.transport.protocal", "smtps");
        mailproperties.put("mail.smtp.STARTTLS.enable", "true");
        mailproperties.put("mail.smtp.auth", "true");
        mailproperties.put("mail.smtps.**ssl.enable", "false");
        mailproperties.setProperty("mail.smtps.**ssl.required", "false");

        EmailGenerator emailgenerator= new EmailGenerator();

        MailAuthenticator auth= emailgenerator.new MailAuthenticator();

        Session session = Session.getInstance(mailproperties, auth);

        try {
             fromaddress= new InternetAddress(from,"Sushant Wadjikar");
             toaddress= new InternetAddress(to);
             ccaddress=new InternetAddress(cc);

        }catch (AddressException ex) {
            // TODO Auto-generated catch block
            ex.printStackTrace();
        } catch (UnsupportedEncodingException ex) {
            // TODO Auto-generated catch block
            ex.printStackTrace();
        }

        Message message= new MimeMessage(session);

        try {
            message.setFrom(fromaddress);
            message.setRecipient(RecipientType.TO, toaddress);
            message.setRecipient(RecipientType.CC, ccaddress);
            message.setSubject("Hello !!! My First Mail from my java program");
            message.setSentDate(new Date());
            message.setText("Good Morning"+"\n"+"This is my first mail, sending it from my java program"+"\n"+"Thanks and Regards"+"\n"+"Sushant");

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

            transport.connect();

            message.saveChanges();

            transport.send(message);

            System.out.println("Mail send successfully.........");

        } catch (MessagingException ex) {
            // TODO Auto-generated catch block
            ex.printStackTrace();
        }
    }
}

回答by Bill Shannon

Thiswill likely fix your problem.

这可能会解决您的问题。

Also, make up your mind on whether you're using the "smtp" protocol or the "smtps" protocol and name the properties accordingly. And there are no properties with "**" in their names.

此外，请决定您使用的是“smtp”协议还是“smtps”协议，并相应地命名属性。并且名称中没有带有“**”的属性。