$to         = '[email protected]';
$subject  = "=?UTF-8?B?".base64_encode('邮件标题')."?=";
$headers  = 'MIME-Version: 1.0' . "rn";
$headers .= 'Content-type: text/html; charset=utf-8' . "rn";
// Additional headers
$headers .= 'To: Xinple <[email protected]>' . "rn";
$headers .= 'From: Admin <[email protected]>' . "rn";
$headers .= 'Reply-To: Xinple <xinple@example>' . "rn";
mail($to, $subject, $message, $headers);