if (preg_match('/^[^0-9][A-z0-9_-]+[@][A-z0-9_-]+([.][A-z0-9_-]+)*[.][A-z]{2,4}$/', $email)) { $emails[] = $email; echo 'mailing' . $email; $subject = 'test'; $message = 'this is a test message'; $extra_headers = 'From: webmaster@example.com' . "\r\n" . 'Reply-To: webmaster@example.com' . "\r\n" . 'X-Mailer: PHP/' . phpversion(); mail($email, $subject, $message, $extra_headers); }