通过Exchange Server使用Javamail发送电子邮件

Question

we have an Exchange Server and i wanted to test sending a mail with it. But somehow i always get the error:

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)

i tried looking at our exchange if anonymous users were allowed and they are, our Printer also send Mails without any authentification.

Here is my Java code, hope someone can help:

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();
    }
}
}

I also tried SimpleMail, but there is the same error.

The Connection to the smtp Server seems to work, but the message cannot be send, cause of the error above. What could it be?

Greetings,

Kevin

Edit:

i found my error, i don't know why our printers can send maisl without errors but it seems i had to whitelist my ip at our exchange server. Code was completely fine.

thanks for the help

Answer 1

I know you are wanting the smtp option, but I have a feeling the issue is how your server is setup and not in your code. If you get the EWS-Java Api, you can log into your exchange server directly and grab mail that way. Below is the code that would make that work:

 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; }
      }
 }

In your code you just have to create the class, then use the sendEmail method to send emails to whomever.

Answer 2

Your JavaMail code is not authenticating to your server , which may be why the server is rejecting the message with that error message. (Spammers often use open email servers.)

Change your code to call the Transport.send method that accepts a user name and password .