Sending a Mail via JavaMail

Mail.java

import java.io.File;
import java.io.FileInputStream;
import java.util.List;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.mail.Address;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class Mail {
    public static final String PASSWORD = "mail.password";
    public static final String USER = "mail.user";
    public static final String SMTP_HOST = "mail.smtp.host";
    public static final String TRANSPORT_PROTOCOL = "mail.transport.protocol";
    public static final String AUTH = "mail.smtp.auth";

    public void send(String from, String to, String cc, String bcc, String subject, String body, List<File> attachments) throws MessagingException, java.io.IOException {
        Properties prop = new Properties();
        prop.load(new FileInputStream(new File("mail.properties")));
        Session session = Session.getDefaultInstance(prop);
        MimeMessage msg = new MimeMessage(session);
        msg.setFrom(new InternetAddress(from));
        msg.addRecipient(Message.RecipientType.TO, new InternetAddress(to));
        msg.addRecipient(Message.RecipientType.CC, new InternetAddress(cc));
        msg.addRecipient(Message.RecipientType.BCC, new InternetAddress(bcc));
        msg.setSubject(subject);

        if (attachments == null || attachments.size() == 0) {
            msg.setText(body);
        } else {
            Multipart multipart = new MimeMultipart();
            MimeBodyPart messageBodyPart = new MimeBodyPart();
            messageBodyPart.setText(body);
            multipart.addBodyPart(messageBodyPart);
            for (File file : attachments) {
                messageBodyPart = new MimeBodyPart();
                DataSource source = new FileDataSource(file);
                messageBodyPart.setDataHandler(new DataHandler(source));
                messageBodyPart.setFileName(file.getName());
                multipart.addBodyPart(messageBodyPart);
            }

            msg.setContent(multipart);
        }

        msg.saveChanges();
        if (Boolean.parseBoolean(prop.getProperty(AUTH))) {
            Transport transport = session.getTransport(prop.getProperty(TRANSPORT_PROTOCOL));
            transport.connect(prop.getProperty(SMTP_HOST), prop.getProperty(USER), prop.getProperty(PASSWORD));
            transport.sendMessage(msg, msg.getAllRecipients());
            transport.close();
        } else {
            Transport.send(msg);
        }

    }
}