php form validation and error messages

php form validation and error messages

I'm setting up this newsletter subscription form to communicate with my
database, but before sending the information(email) I just want to
validate it. However when I enter wrong or empty data, it displays both
error messages. I'm no expert on PHP but it seems I'm missing some closing
brackets or something.. I've fiddled around now for a while with no
success, so I turn for help to you guys again :)
<?php
$host = "XXX";
$username = "name";
$password = "XXX";
$database = "base";
$connect = @mysql_connect($host, $username, $password) or die
(@mysql_error());
$selectdb = @mysql_select_db($database, $connect) or die (@mysql_error());
if(isset($_POST['submit'])){
$email = $_POST['email'];
if(empty($email)){
echo "Hmm, you did not anything..";
}
if (!preg_match(
"/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i",
$email_address))
{
echo "This email not valid";
}
else{
@mysql_query("INSERT INTO newsletters SET email='$email'");
echo "Thanks you";
}
}
?>
Thank you!!