Email verification for new users?

[virtuexru]

Ok, so I have a registration form setup. And now I'm wondering, how do I automatically send them an email with their username and password after they have successfully signed up? I have the following variables:

[code]
$user = $_POST['user_id'];
//get username from form
$pass = $_POST['user_password'];
//get password from form
$pass2 = $_POST['user_password2'];
//password check
$name = $_POST['fullname'];
//get name from form
$domain = $_POST['domain'];
//get domain from form
$zip = $_POST['zip'];
//get zip from form
$city = $_POST['city'];
//get city from form
$email = $_POST['email'];
//get email from form
$state = $_POST['state'];
//get state from form
$country = $_POST['country'];
//get country from form
$address = $_POST['address'];
//get address from form
$phone = $_POST['phone'];
//get phone from form

//after all the verification...

    $request = "INSERT INTO tbl_auth_user values('$user',PASSWORD('$pass'),'$name',
    '$email','$domain','$zip','$city','$state','$country',
    '$address','$phone')";
    $results = mysql_query($request);
    if($results) //if this operation goes smooth we send the visitor to a
    //previously created error page
    {
        header("Location: accountok.php"); //the user will be sent to this page
    }
    else //is any kind of issue is found
    {
        header("Location: error-account.php"); //the user will be sent to
        //this previously created page
    }
    mysql_close($link); // we close the connection
    Die();
[/code]

[xtentic]

check php.net for mail

that's all

[Fuego]

$message = "$user -username\n";
$message .= "$pass -password\n";
$success = mail($to, $subject, $message, $headers);
if ($success){
echo"<h2>message sent</h2>";

}else{
echo"<h2>message failed to send</h2>";
}