function sendmail($umail, $aid, $uname, $md5string, $gid)
{
    //todo: 從group table 中讀出smtp的資訊
    global $conn;
    $sql = "SELECT * FROM `blog_article` where `id`={$aid}";
    $rs =& $conn->Execute($sql);
    $rsdata = $rs->getArray();
    $article = $rsdata[0]["content"];
    $title = $rsdata[0]["title"];
    $to = $umail;
    $authenticateURL = __SITE_URL . "unregister.php?key=" . $md5string;
    $authenticateURL = "<a href=\"{$authenticateURL}\">{$authenticateURL}</a>";
    $title = str_replace('{$uname}', $uname, $title);
    $body = $article;
    $body = str_replace('{$uname}', $uname, $body);
    $body = str_replace('{$umail}', $umail, $body);
    $body = str_replace('{$url}', $authenticateURL, $body);
    $body = preg_replace('/\\\\/', '', $body);
    //Strip backslashes
    $mailobj = get_mailobj_from_gid($conn, $gid);
    $mailobj->AddAddress($to);
    $mailobj->Subject = $title;
    $mailobj->MsgHTML($body);
    $mailobj->AltBody = $body;
    $mailobj->Send();
    $sql = "INSERT INTO `alread_sent` (`aid` ,`email` , `gid`,`open`)VALUES ('{$aid}', '{$umail}',{$gid} ,'')";
    $rs =& $conn->Execute($sql);
    echo "send {$umail}, {$aid},{$gid} <br><br>";
}
    }
} else {
    $message = "E-mail填寫錯誤";
}
if ($message == "") {
    $groupObj = get_group_content($conn, $gid);
    $to = $mail;
    $authenticateURL = __SITE_URL . "authenticate.php?key=" . $md5string;
    $authenticateURL = "<a href=\"{$authenticateURL}\">{$authenticateURL}</a>";
    $body = $groupObj["checkMail"];
    $body = str_replace('{$uname}', $uname, $body);
    $body = str_replace('{$umail}', $mail, $body);
    $body = str_replace('{$url}', $authenticateURL, $body);
    $body = preg_replace('/\\\\/', '', $body);
    //Strip backslashes
    $mailobj = get_mailobj_from_gid($conn, $gid);
    $mailobj->AddAddress($to);
    $mailobj->AddBCC("*****@*****.**");
    $mailobj->Subject = $groupObj["checkTitle"];
    $mailobj->MsgHTML($body);
    $mailobj->AltBody = $body;
    $mailobj->Send();
}
$desc_url = $groupObj["desc_url"];
header("Location: {$desc_url}");
//=============================================
function checkmail($mail)
{
    if (!preg_match("/.*@.*..*/", $mail) | preg_match("/(<|>)/", $mail)) {
        return false;
    } else {