Bulk mail sending project in java

Here is a basic outline of a bulk mail sending project in Java:

Project Requirements:

• Send a large number of emails to a list of recipients
• Each email should have a unique subject and body
• The project should be able to handle a large volume of emails without crashing
• The project should be able to handle exceptions and errors

Project Structure:

• BulkMailSender class: responsible for sending the emails
• Email class: represents an individual email with subject and body
• Recipient class: represents a recipient with email address and other details
• MailList class: represents a list of recipients

Code:

Here is some sample code to get you started:

import java.util.ArrayList;
import java.util.List;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

public class BulkMailSender {
    public static void main(String[] args) {
        // Create a list of recipients
        List<Recipient> recipients = new ArrayList<>();
        recipients.add(new Recipient("[email protected]", "John Doe"));
        recipients.add(new Recipient("[email protected]", "Jane Doe"));
        //...

        // Create a list of emails
        List<Email> emails = new ArrayList<>();
        emails.add(new Email("Subject 1", "Body 1"));
        emails.add(new Email("Subject 2", "Body 2"));
        //...

        // Send the emails
        for (Recipient recipient : recipients) {
            for (Email email : emails) {
                sendEmail(recipient.getEmail(), email.getSubject(), email.getBody());
            }
        }
    }

    public static void sendEmail(String to, String subject, String body) {
        try {
            // Create a session
            Session session = Session.getDefaultInstance(new Properties(), null);

            // Create a message
            MimeMessage message = new MimeMessage(session);
            message.setFrom(new InternetAddress("[email protected]"));
            message.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
            message.setSubject(subject);
            message.setText(body);

            // Send the message
            Transport.send(message);
        } catch (MessagingException e) {
            System.out.println("Error sending email: " + e.getMessage());
        }
    }
}

class Email {
    private String subject;
    private String body;

    public Email(String subject, String body) {
        this.subject = subject;
        this.body = body;
    }

    public String getSubject() {
        return subject;
    }

    public String getBody() {
        return body;
    }
}

class Recipient {
    private String email;
    private String name;

    public Recipient(String email, String name) {
        this.email = email;
        this.name = name;
    }

    public String getEmail() {
        return email;
    }
}

How it works:

1. The BulkMailSender class creates a list of recipients and a list of emails.
2. It then loops through each recipient and sends an email to each recipient using the sendEmail method.
3. The sendEmail method creates a new MimeMessage object and sets the from address, to address, subject, and body of the email.
4. It then sends the email using the Transport.send method.
5. If an error occurs while sending the email, the MessagingException is caught and an error message is printed to the console.

Note:

• This is a very basic implementation and you may want to add more features such as:
  • Handling bounces and errors
  • Tracking the status of each email
  • Sending emails in batches to avoid overwhelming the mail server
  • Using a more robust email library such as JavaMail API
• You will also need to configure your email server settings and obtain the necessary credentials to send emails.