Someone

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);
}