如何使用java发送未经身份验证的电子邮件

我想用java发送没有身份验证的电子邮件。 有人能帮我吗

对于身份验证，我的操作如下：

    public void sendEmail() throws EmailException{
    SimpleEmail email = new SimpleEmail();
    email.setHostName("smtp.gmail.com");
    email.setSmtpPort(465);
    email.addTo("XXX@gmail.com", "XXXX");
    email.setFrom("XXXX@gmail.com","XXXXX");
    email.setSubject("testando . . .");
    email.setMsg("testando 1");
    email.setSSL(true);
    email.setAuthentication("xxxxxx@gmail.com", "XXXXX");
    email.send();
}

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我忘了说我没有医疗机构。最后，我需要一个提供商，我有来自主题和消息的电子邮件，需要如何发送此电子邮件？

尝试以下示例：

// File Name SendEmail.java

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;

public class SendEmail
{
   public static void main(String [] args)
   {    
      // Recipient's email ID needs to be mentioned.
      String to = "abcd@gmail.com";

      // Sender's email ID needs to be mentioned
      String from = "web@gmail.com";

      // Assuming you are sending email from localhost
      String host = "localhost";

      // Get system properties
      Properties properties = System.getProperties();

      // Setup mail server
      properties.setProperty("mail.smtp.host", host);

      // Get the default Session object.
      Session session = Session.getDefaultInstance(properties);

      try{
         // Create a default MimeMessage object.
         MimeMessage message = new MimeMessage(session);

         // Set From: header field of the header.
         message.setFrom(new InternetAddress(from));

         // Set To: header field of the header.
         message.addRecipient(Message.RecipientType.TO,
                                  new InternetAddress(to));

         // Set Subject: header field
         message.setSubject("This is the Subject Line!");

         // Now set the actual message
         message.setText("This is actual message");

         // Send message
         Transport.send(message);
         System.out.println("Sent message successfully....");
      }catch (MessagingException mex) {
         mex.printStackTrace();
      }
   }
}

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Via:

如果仅用于测试目的，您可以尝试。运行时，Papercut会自动拾取发送到任何IP地址的标准SMTP端口（25）的电子邮件。你只需从你的申请表中发送邮件，然后切换到剪纸来查看它

github剪纸：

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我忘了说我没有医疗机构。我需要一个提供商最后，我有一封来自主题和消息的电子邮件，需要如何发送此电子邮件？你看到答案末尾的链接了吗？我不太理解您在评论中的疑问？这与Java无关。只有在邮件服务器允许的情况下，您才可以发送电子邮件而不进行身份验证，在这种情况下，您将省略

setAuthentication（）

调用。如果SMTP服务器需要身份验证，则必须提供身份验证。如果您正在测试，则可以使用模拟SMTP服务器，或设置自己的真实SMTP服务器，并在不进行身份验证的情况下对其进行配置。遇到问题com.sun.mail.SMTP.SMTPSendFailedException:530-5.7.0需要身份验证。了解更多信息，请访问530 5.7.0 o6sm1435614pgg.37-gsmtp，访问com.sun.mail.SMTPTransport.issueSendCommand（SMTPTransport.java:2249），访问com.sun.mail.SMTPTransport.mailFrom（SMTPTransport.java:1740），访问com.sun.mail.smtp.SMTPTransport.sendMessage（SMTPTransport.java:1239），访问javax.mail.Transport.send0（Transport.java:255）在javax.mail.Transport.send（Transport.java:124）在com.necti.smsemail.SimpleEmail.main（SimpleEmail.java:59）如果我想使用sendgrid apikey，我应该如何发送它？

import java.util.Date;
import java.util.Properties;

import javax.mail.Message.RecipientType;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class SendMail {

    public static void main(String[] args) throws Exception {
        Properties props = new Properties();
        props.put("mail.smtp.host", "127.0.0.1");
        props.put("mail.smtp.port", "25");
        props.put("mail.debug", "true");
        Session session = Session.getDefaultInstance(props);
        MimeMessage message = new MimeMessage(session);
        message.setFrom(new InternetAddress("admin@test.com"));
        message.setRecipient(RecipientType.TO, new InternetAddress("a@b.com"));
        message.setSubject("Notification");
        message.setText("Successful!", "UTF-8"); // as "text/plain"
        message.setSentDate(new Date());
        Transport.send(message);
    }

}

import java.util.*;
import javax.mail.*;

public class SimpleEmail {

    public static void main(String[] args) {
        System.out.println("SimpleEmail Start");
        String smtpHostServer = "smtp.gmail.com";
        String toEmail = "XXXX@gmail.com";
        Properties props = System.getProperties();
        props.put("mail.smtp.host", smtpHostServer);
        props.put("mail.smtp.starttls.enable", true);
        props.put("mail.smtp.port", "25");
        Session session = Session.getDefaultInstance(props);
        try {
            MimeMessage msg = new MimeMessage(session);
            msg.addHeader("Content-type", "text/HTML; charset=UTF-8");
            msg.addHeader("format", "flowed");
            msg.addHeader("Content-Transfer-Encoding", "8bit");
            msg.setFrom(new InternetAddress("n91eply@gmail.com", "NoReply-JD"));
            msg.setReplyTo(InternetAddress.parse("n91eply@gmail.com", false));
            msg.setSubject("SimpleEmail Testing Subject", "UTF-8");
            msg.setText("SimpleEmail Testing Body", "UTF-8");
            msg.setSentDate(new Date());
            msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(toEmail, false));
            System.out.println("Message is ready");
            Transport.send(msg);
            System.out.println("EMail Sent Successfully!!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}