public function sendActivationMail($user)
{
$activation = new Activation();
$activation->setSfGuardUser($user);
$key = sha1($user->getUsername() . time());
$activation->setActivationKey($key);
$activation->save();
$message = $this->getMailer()->composeAndSend('*****@*****.**', $user->getEmailAddress(), 'Please confirm your registration!', 'Hello ' . $user->getName() . ',
Please click on the following link to complete your registration:
' . $this->generateUrl('register_activation', array('activation_key' => $activation->getActivationKey()), true) . '
We hope you will have fun!');
$this->getUser()->setFlash('notice', 'Un mail de confirmation vous a été envoyé !');
$this->redirect('@homepage');
}