Laravel 4: how to make confirmation email?

I have made until now an app with login/register and it works fine. After the registration a welcome email is sent.

But what i would like to do is to send a link, within that mail, that only after clicking on it, it is possible to login.

Like the common registration email for forum etc..

Someone can help me please?

This is the postRegister method:

public function postRegister()
{
    $input = Input::all();

    $rules = array(
        'username' => 'required',
        'password' => 'required');

    $validation = Validator::make($input, $rules);

    if ($validation->passes()) {

        $password = $input['password'];
        $password = Hash::make($password);

        $user = new User;
        $user->username = $input['username'];
        $user->email = $input['email'];
        $user->password = $password;

            $mailer = new Mailers\UserMailer($user);

                 // var_dump($mailer);

                    $mailer->welcomeMail()->deliver();

                    $user->save();

        return Redirect::to('afterRegister');
    }

    return Redirect::back()->withInput()->withErrors($validation)->with('message', 'Validation Errors!');
}

Thank you

Here are a few clues (not gonna write the code for you).

Add two fields to your user table: confirmation, confirmed.
Create a route in Laravel like registration/verify/{confirmation}, in which you try and find a user in your DB with the given confirmation code (if found, set user's confirmed field to 1).
Upon user registration, generate a unique confirmation code (you can use the str_random() helper function for this).
Set DB entry of new user accordingly (confirmation = the random code, confirmed = 0)
Include a verification link (built according to your verification route) with the generated confirmation code in your email to your new user.

Auth attempts can now be done like this:

$user = array(
        'username' => Input::get('username'),
        'password' => Input::get('password'),
        'confirmed' => 1
);

if (Auth::attempt($user)) {
    // success!
    return Redirect::route('restricted/area');
}