如何使用Java发送未经认证的电子邮件

Question

我希望使用Java发送无需验证的电子邮件。有人能帮我吗？ 有了验证，我可以按照以下步骤操作：

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

我忘记说了，我没有提供商。最终我需要一个提供商，我有“发件人”、“主题”和“消息”，需要如何发送这封电子邮件？

- felipe muner

---

这与Java无关。如果邮件服务器允许，您可以发送未经身份验证的电子邮件，此时您将省略“ setAuthentication()”调用。如果SMTP服务器需要身份验证，则必须提供身份验证信息。如果您正在进行测试，可以使用模拟SMTP服务器，或者设置自己的真实SMTP服务器并在没有身份验证的情况下配置它。 - Jim Garrison

Answer 1

如果只是为了测试目的，您可以尝试使用Papercut。当它正在运行时，Papercut会自动接收发送到任何IP地址上标准SMTP端口（25）的电子邮件。您只需从应用程序发送邮件并切换到Papercut进行查看。

Papercut @ github: https://github.com/ChangemakerStudios/Papercut/releases

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("[e-mail]"));
        message.setRecipient(RecipientType.TO, new InternetAddress("[e-mail]"));
        message.setSubject("Notification");
        message.setText("Successful!", "UTF-8"); // as "text/plain"
        message.setSentDate(new Date());
        Transport.send(message);
    }

}

- Paul Vargas

---

如果我想使用SendGrid API密钥，我应该如何发送它？ - sskumar86

Github的链接仍然可以使用，但Papercut的网站链接已失效。 - Akito

Answer 2

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 = "[e-mail]";
        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("[e-mail]", "NoReply-JD"));
            msg.setReplyTo(InternetAddress.parse("[e-mail]", 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();
        }
    }
}

- sarbjeet singh

---

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 https://support.google.com/mail/?p=WantAuthError o6sm1435614pgg.37 - gsmtp在com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2249)处 在com.sun.mail.smtp.SMTPTransport.mailFrom(SMTPTransport.java:1740)处 在com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1239)处 在javax.mail.Transport.send0(Transport.java:255)处 在javax.mail.Transport.send(Transport.java:124)处 在com.necti.smsemail.SimpleEmail.main(SimpleEmail.java:59)处 - sarbjeet singh

Answer 3

试试这个例子：

// 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 = "[e-mail]";

      // Sender's email ID needs to be mentioned
      String from = "[e-mail]";

      // 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();
      }
   }
}

来源：tutorialspoint

- Adriano

---

我忘了说我没有提供者。 我需要一个提供者。最后，我有发件人、主题和消息的电子邮件，需要发送这封电子邮件。怎么做？ - felipe muner

你看到了答案末尾的链接吗？ 我不太明白你在评论中的疑问。 - Adriano