Noam noam-sc

## validmail.php
if(!filter_var($mail_to_check, FILTER_VALIDATE_EMAIL)) {
  // Invalid mail
} else {
  // Valid mail
}

## ip.php
$user_ip = (isset($_SERVER["HTTP_CF_CONNECTING_IP"])?$_SERVER["HTTP_CF_CONNECTING_IP"]:$_SERVER['REMOTE_ADDR']);
	if(!filter_var($mail_to_check, FILTER_VALIDATE_EMAIL)) {
	// Invalid mail
	} else {
	// Valid mail
	}