Erro utilizando javax.mail para envio de mala direta

Programação Java
#1

Olá pessoa,

Sou novo aqui no forum e vou postar minha primeira dúvida.
Estou fazendo um programa para enviar email (usei como base um artigo que achei aqui no forum) e está dando o seguinte erro:

Exception in thread “main” java.lang.Error: Unresolved compilation problems:
Access restriction: The type Session is not accessible due to restriction on required library C:\Program Files\Java\jre6\lib\ext\mail.jar
Access restriction: The type Session is not accessible due to restriction on required library C:\Program Files\Java\jre6\lib\ext\mail.jar
Access restriction: The method getInstance(Properties, Authenticator) from the type Session is not accessible due to restriction on required library C:\Program Files\Java\jre6\lib\ext\mail.jar
MimeMessage cannot be resolved to a type
MimeMessage cannot be resolved to a type
InternetAddress cannot be resolved to a type
Access restriction: The type Message is not accessible due to restriction on required library C:\Program Files\Java\jre6\lib\ext\mail.jar
Access restriction: The type Message.RecipientType is not accessible due to restriction on required library C:\Program Files\Java\jre6\lib\ext\mail.jar
Access restriction: The field TO from the type Message.RecipientType is not accessible due to restriction on required library C:\Program Files\Java\jre6\lib\ext\mail.jar
InternetAddress cannot be resolved to a type
Access restriction: The type Transport is not accessible due to restriction on required library C:\Program Files\Java\jre6\lib\ext\mail.jar
AddressException cannot be resolved to a type
Access restriction: The type MessagingException is not accessible due to restriction on required library C:\Program Files\Java\jre6\lib\ext\mail.jar

at SendMail.main(SendMail.java:13)

Segue também o código fonte:

import java.util.Properties;
import java.util.Date;
import javax.mail.;
import com.sun.mail.;

public class SendMail
{
public static void main(String [] args) throws Exception
{
Properties p = new Properties();
p.put(“mail.host”, “smtp2.locaweb.com.br”);

Session session = Session.getInstance(p, null);
MimeMessage msg = new MimeMessage(session);

try {
msg.setFrom(new InternetAddress(“nos@guj.com.br”));
msg.setRecipient(Message.RecipientType.TO, new InternetAddress(“voces@guj.com.br”));

msg.setSentDate(new Date());

msg.setSubject(“assunto da mensagem”);

msg.setText(“corpo da mensagem”);

Transport.send(msg);
}
catch (AddressException e) {
// nunca deixe catches vazios!
}
catch (MessagingException e) {
// nunca deixe catches vazios!
}
}
}

Abraços

#2