i always get an exception on mail gettransport()

the code is not very complicated 

but i never go further gettransport

imports :

import java.util.Properties;

import javax.mail.Message;

import javax.mail.MessagingException;

import javax.mail.Session;

import javax.mail.Transport;

import javax.mail.internet.AddressException;

import javax.mail.internet.InternetAddress;

import javax.mail.internet.MimeMessage;

and the source :

       String host = "auth.smtp.1and1.fr";

       String username = "xx@uu.com";

       String password = "yy";

       Properties props = new Properties();

       

       props.put("mail.smtp.starttls.enable", "true");

       props.put("mail.transport.protocol", "smtp");

       props.put("mail.smtp.auth", "true");

       

       Session session = Session.getInstance(props,null);

       

       //MimeMessage msg = new MimeMessage(session);

       // set the message content here

       Transport transport = session.getTransport("smtp");

and what i get:

javax.mail.NoSuchProviderException: Unable to locate provider for protocol: smtp

thanks 

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