A mail user agent in java solution

Here is a simple example of a Mail User Agent (MUA) in Java using the JavaMail API:

MailUserAgent.java

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

public class MailUserAgent {
    public static void main(String[] args) {
        // Set up mail server properties
        Properties props = new Properties();
        props.put("mail.smtp.host", "your-smtp-host");
        props.put("mail.smtp.port", "your-smtp-port");
        props.put("mail.smtp.auth", "true");

        // Create a session
        Session session = Session.getInstance(props, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("your-email-username", "your-email-password");
            }
        });

        // Create a message
        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("your-email-username"));
        message.setRecipient(Message.RecipientType.TO, new InternetAddress("recipient-email-username"));
        message.setSubject("Test email");
        message.setText("This is a test email");

        // Send the message
        Transport.send(message);
    }
}

This code sets up a mail session with the specified SMTP host, port, and authentication credentials. It then creates a new message with a from address, to address, subject, and text body. Finally, it sends the message using the Transport.send() method.

Note: You'll need to replace the placeholders (your-smtp-host, your-smtp-port, your-email-username, your-email-password, and recipient-email-username) with your actual mail server settings and email credentials.

Additional features:

To add more features to your MUA, you can use the JavaMail API's various classes and methods. For example:

To add attachments, you can use the MimeBodyPart class and its addAttachment() method.
To set a reply-to address, you can use the Message.setReplyTo() method.
To set a priority for the message, you can use the Message.setPriority() method.
To set a custom header, you can use the Message.setHeader() method.

Here's an updated example that adds an attachment and sets a reply-to address:

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

public class MailUserAgent {
    public static void main(String[] args) {
        // Set up mail server properties
        Properties props = new Properties();
        props.put("mail.smtp.host", "your-smtp-host");
        props.put("mail.smtp.port", "your-smtp-port");
        props.put("mail.smtp.auth", "true");

        // Create a session
        Session session = Session.getInstance(props, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication("your-email-username", "your-email-password");
            }
        });

        // Create a message
        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("your-email-username"));
        message.setRecipient(Message.RecipientType.TO, new InternetAddress("recipient-email-username"));
        message.setSubject("Test email");
        message.setText("This is a test email");

        // Add an attachment
        MimeBodyPart attachment = new MimeBodyPart();
        attachment.setFileName("example.txt");
        attachment.setContent("This is an example attachment", "text/plain");
        Multipart multipart = new MimeMultipart();
        multipart.addBodyPart(attachment);
        message.setContent(multipart);

        // Set a reply-to address
        message.setReplyTo(new InternetAddress("reply-to-email-username"));

        // Send the message
        Transport.send(message);
    }
}

This code adds an attachment to the message using the MimeBodyPart class and sets a reply-to address using the Message.setReplyTo() method.

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A mail user agent in java solution