javax.mail：无法向 SMTP 主机发送命令

Question

我是 Java Mail 的新手。当我执行下面的代码时，我遇到了一个异常javax.mail.MessagingException：无法向 SMTP 主机发送命令public void sendMessage(EmailMessage emailMessage) throws MessagingException {    Properties props = new Properties();    props.put("mail.smtp.auth", "true");    props.put("mail.smtp.starttls.enable", "true");    props.put("mail.smtp.host", "smtp.gmail.com");    props.put("mail.smtp.port", "587");    System.out.println(emailMessage.getFromAddress());    Optional<EmailId> emailIdOptional = emailIdRepository.findByEmailId(emailMessage.getFromAddress());    System.out.println(emailIdOptional.get().getEmailId());    Session session = Session.getInstance(props, new javax.mail.Authenticator() {        protected PasswordAuthentication getPasswordAuthentication() {            return new PasswordAuthentication(emailIdOptional.get().getEmailId(), emailIdOptional.get().getPassword());        }    });    javax.mail.Message msg = new MimeMessage(session);    msg.setFrom(new InternetAddress(emailMessage.getFromAddress(), false));    msg.setRecipients(javax.mail.Message.RecipientType.TO, InternetAddress.parse(emailMessage.getToAddress()));    msg.setSubject(emailMessage.getSubject());    msg.setContent(emailMessage.getMessage(), "text/html");    msg.setSentDate(new Date());    MimeBodyPart messageBodyPart = new MimeBodyPart();    messageBodyPart.setContent(emailMessage.getMessage(), "text/html");    Transport.send(msg);}任何人都请帮我解决这个问题。

Answer 1

String host = "smtp.xyz.com";

final String username = "[e-mail]";

final String password = "your password";

Properties props = new Properties();

props.put("mail.smtp.auth", "true");

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

// go to account setting -> smtp setting and get server name and port

props.put("mail.smtp.host", "your server name");

props.put("mail.smtp.port", "your server port");

props.put("mail.debug", "true");

try {

    Session session = Session.getInstance(prop,

            new javax.mail.Authenticator() {

                protected javax.mail.PasswordAuthentication getPasswordAuthentication() {

                    return new javax.mail.PasswordAuthentication(username, password);

                }

            });

    Message msg = new MimeMessage(session);

    msg.setFrom(new InternetAddress("[e-mail]"));

    msg.setRecipients(Message.RecipientType.TO,

            InternetAddress.parse("[e-mail]"));

    msg.setSubject("Test E-Mail through Java");

    Transport.send(msg,username,password);

    System.out.println("Sent message successfully...");

}catch(Exception e){

}

你可以试试这个可能会解决你的问题！！！！

Answer 2

此代码对我有用：-

public static void SendMessage(final String femail, final String fpass, final String email, final String subject, final String message)

{

//Creating properties

Properties props = new Properties();

//Configuring properties for gmail

//If you are not using gmail you may need to change the values

 props.put("mail.smtp.host", "smtp.gmail.com");

 props.put("mail.smtp.port", "587");

 props.put("mail.smtp.auth", "true");

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

 props.put("mail.smtp.ssl.trust", "smtp.gmail.com");     

//Creating a new session

Session session = Session.getDefaultInstance(props,

        new javax.mail.Authenticator() {

            //Authenticating the password

            protected PasswordAuthentication getPasswordAuthentication() {

                return new PasswordAuthentication(femail, fpass);

            }

        });

try {

    //Creating MimeMessage object

    MimeMessage mm = new MimeMessage(session);

    //Setting sender address

    mm.setFrom(new InternetAddress(femail));

    //Adding receiver

    mm.addRecipient(Message.RecipientType.TO, new InternetAddress(email));

    //Adding subject

    mm.setSubject(subject);

    //Adding message

    mm.setText(message);           

    //Sending email

    Transport.send(mm);

} catch (MessagingException e) {

    e.printStackTrace();

}

}

我已经编辑了代码并使用 starttls 方法进行了设置。

希望会有所帮助！！！！