通过 Exchange Server 使用 Javamail 发送电子邮件

Question

我们有一个 Exchange Server，我想测试用它发送邮件。但不知何故，我总是得到错误：

com.sun.mail.smtp.SMTPSendFailedException: 550 5.7.1 Message rejected as spam by Content Filtering.

at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:2108)
at com.sun.mail.smtp.SMTPTransport.finishData(SMTPTransport.java:1889)
at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1120)
at javax.mail.Transport.send0(Transport.java:195)
at javax.mail.Transport.send(Transport.java:124)
at Test.sendMailJava(Test.java:89)
at Test.main(Test.java:29)

如果允许匿名用户并且他们是允许的，我尝试查看我们的交换，我们的打印机也会发送未经任何身份验证的邮件。

这是我的Java代码，希望有人能帮忙：

import java.net.URI;
import java.util.Properties;

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

import org.simplejavamail.email.Email;
import org.simplejavamail.mailer.Mailer;
import org.simplejavamail.mailer.config.ProxyConfig;
import org.simplejavamail.mailer.config.ServerConfig;
import org.simplejavamail.util.ConfigLoader;

public class Test {

public static void main(String[] args) {
////        // TODO Auto-generated method stub
    sendMailJava();
}

public static void sendMailJava()
{
    String to = "Recipient"
    // Sender's email ID needs to be mentioned
    String from = "Sender";

    // Assuming you are sending email from localhost
    String host = "Server Ip-Adress";

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

    // Setup mail server
    properties.setProperty("mail.smtp.host", host);
    properties.setProperty("mail.smtp.port", "25");
    properties.setProperty("mail.imap.auth.plain.disable","true");
    properties.setProperty("mail.debug", "true");
    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("Subject");
        // Now set the actual message
        message.setContent("Content", "text/html; charset=utf-8");
        // Send message
        Transport.send(message);
        System.out.println("Sent message successfully....");
    }catch (MessagingException mex) {
    mex.printStackTrace();
    }
}
}

我也试过 SimpleMail，但还是一样的错误。

与 smtp 服务器的连接似乎有效，但无法发送消息，原因是上述错误。会是什么？

您好，

凯文

编辑：

我发现了我的错误，我不知道为什么我们的打印机可以毫无错误地发送邮件，但似乎我不得不在我们的交换服务器上将我的 ip 列入白名单。代码完全没问题。

感谢帮助

Answer 1

您的 JavaMail 代码是 not authenticating to your server，这可能是服务器拒绝带有该错误消息的消息的原因。 （垃圾邮件发送者通常使用开放式电子邮件服务器。）

更改您的代码以调用Transport.send method that accepts a user name and password。

Answer 2

我知道您想要 smtp 选项，但我感觉问题在于您的服务器是如何设置的，而不是在您的代码中。如果您获得 EWS-Java Api，您可以直接登录到您的交换服务器并以这种方式获取邮件。下面是可以实现该功能的代码：

 public class ExchangeConnection {
      private final ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2); // change to whatever server you are running, though 2010_SP2 is the most recent version the Api supports

      public ExchangeConnection(String username, String password) {
           try {
                service.setCredentials(new WebCredentials(username, password));
                service.setUrl(new URI("https://(your webmail address)/ews/exchange.asmx"));
           }
           catch (Exception e) { e.printStackTrace(); }
      }

      public boolean sendEmail(String subject, String message, List<String> recipients, List<String> filesNames) {
           try {
                EmailMessage email = new EmailMessage(service);
                email.setSubject(subject);
                email.setBody(new MessageBody(message));
                for (String fileName : fileNames) email.getAttachments().addFileAttachment(fileName);
                for (String recipient : recipients) email.getToRecipients().add(recipient);
                email.sendAndSaveCopy();
                return true;
           }
           catch (Exception e) { e.printStackTrace(); return false; }
      }
 }

在您的代码中，您只需创建类，然后使用 sendEmail 方法向任何人发送电子邮件。