SubethaSmtp example - spring-boot

Question

Can you please tell me how to use SubethaSmtp library?
<dependency>
<groupId>org.subethamail</groupId>
<artifactId>subethasmtp</artifactId>
<version>3.1.7</version>
<scope>test</scope>
</dependency>
I just want to listen to the emails on a port number from my Gmail/outlook inbox and display them in console window/log them in text file/DB.
I studied most of the API doc but I'm not being able to put the pieces together to get the things working.
Can you please tell me about a working example in spring-boot?
Here is my code below so far
package emailbox;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Service;
import org.subethamail.smtp.helper.SimpleMessageListenerAdapter;
import org.subethamail.smtp.server.SMTPServer;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
#SuppressWarnings("restriction")
#PropertySource("/emailbox.properties")
#Service
public class SMTPServerService {
#Value("${smtpserver.enabled}")
String enabled="";
#Value("${smtpserver.hostName}")
String hostName="";
#Value("${smtpserver.port}")
String port="";
SMTPServer smtpServer;
public SMTPServerService() {
}
#PostConstruct
public void start() {
if(enabled.equalsIgnoreCase("true"))
{
SimpleMessageListenerImpl l = new SimpleMessageListenerImpl();
smtpServer = new SMTPServer(new SimpleMessageListenerAdapter(l));
smtpServer.setHostName(this.hostName);
smtpServer.setPort(Integer.valueOf(port));
smtpServer.start();
System.out.println("****** SMTP Server is running for domain "+smtpServer.getHostName()+" on port "+smtpServer.getPort());
} else {
System.out.println("****** SMTP Server NOT ENABLED by settings ");
}
}
#PreDestroy
public void stop() {
if(enabled.equalsIgnoreCase("true")){
System.out.println("****** Stopping SMTP Server for domain "+smtpServer.getHostName()+" on port "+smtpServer.getPort());
smtpServer.stop();
}
}
public boolean isRunning() {
return smtpServer.isRunning();
}
}
package emailbox;
import java.io.InputStream;
import java.util.Properties;
import javax.mail.Session;
import javax.mail.internet.MimeMessage;
import org.subethamail.smtp.helper.SimpleMessageListener;
public class SimpleMessageListenerImpl implements SimpleMessageListener {
public SimpleMessageListenerImpl() {
}
#Override
public boolean accept(String from, String recipient) {
return true;
}
#Override
public void deliver(String from, String recipient, InputStream data) {
Session session = Session.getDefaultInstance(new Properties());
MimeMessage m = new MimeMessage(session,data);
ReceivedEmail email=new ReceivedEmail(m);
// ... here we go with email message ...
}
}

Answer 1

Subetha SMTP is used for building an SMTP Server.
You should be using POP or IMAP for this purpose to read emails from your inbox.
Please see the example below: You just need java mail api.
public void receiveMail(){
Properties props = System.getProperties();
props.setProperty("mail.store.protocol", "imap");
props.put("mail.imap.host", host);
props.put("mail.imap.port", port);
props.put("mail.imap.auth.login.disable", "true");
props.put("mail.imap.auth.plain.disable", "false");
//props.put("mail.imap.ssl.enable", "true");
props.put("mail.debug", "true");
props.put("mail.debug.auth", "true");
Session session = Session.getInstance(props, new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(user, pwd);
}
});
store = (IMAPStore) session.getStore("imap");
store.connect(host, user, pwd);
folder = (IMAPFolder) store.getFolder("INBOX");
openFolder(folder);
}
public static void openFolder(IMAPFolder folder) throws MessagingException, IOException{
String subject = null;
if (!folder.isOpen())
folder.open(Folder.READ_WRITE);
Message[] messages = folder.getMessages();
System.out.println("No of Messages : " + folder.getMessageCount());
System.out.println("No of Unread Messages : " + folder.getUnreadMessageCount());
System.out.println(messages.length);
if (messages.length > 0) {
for (int i = 0; i < 1; i++) {
System.out.println("*****************************************************************************");
System.out.println("MESSAGE " + (i + 1) + ":");
Message msg = messages[i];
System.out.println("Message Number: " + msg.getMessageNumber());
// Object String;
System.out.println("UID: " + folder.getUID(msg));
subject = msg.getSubject();
System.out.println("Subject: " + subject);
System.out.println("From: " + msg.getFrom()[0]);
System.out.println("To: " + msg.getAllRecipients()[0]);
System.out.println("Date: " + msg.getReceivedDate());
System.out.println("Size: " + msg.getSize());
System.out.println(msg.getFlags());
System.out.println("Body: \n" + msg.getContent());
System.out.println(msg.getContentType());
}
}
}

Answer 2

A full example of receiving emails with SubEtha SMTP (and maybe if you're using Spring Boot also) is available here