Need to stop notfications from sending if criteria is not met

I have looked through the forums and have not seen a way to do what I want.

What I want is simple. I wanted all forms to submit successfully but if the sum of two of the fields is not equal to a given amount then I want the notification to be canceled.

Example:
If field 1 = 5 and field 2 = 5, the sum of those two fields is 10. Send the notification
If field 1 = 4 and field 2 = 7, the sum of those two fields is 11. Send the notification.
If field 1 = 4 and field 2 = 4, the sum of those two fields is less than 10. Don't send the notification.

yeah I figured it out actually but I didn't do it that way.

This is what I did:
'function before_email($email){
//cancel sending emails
//print_r($_POST);
if ($_POST[gform_submit] == 1) {
$totalreach = $_POST['input_29'] + $_POST['input_30'];
if ($totalreach >= 10000) {
$email["abort_email"] = false;
}
else {
$email["abort_email"] = true;
}
}
return $email;
}'