这里应该都填对了，但是无法发送邮件，显示超时？
<html>
<head><title>504 Gateway Time-out</title></head>
<body>
<center><h1>504 Gateway Time-out</h1></center>
<hr><center>openresty</center>
</body>
</html>
<!– a padding to disable MSIE and Chrome friendly error page –>
<!– a padding to disable MSIE and Chrome friendly error page –>
<!– a padding to disable MSIE and Chrome friendly error page –>
<!– a padding to disable MSIE and Chrome friendly error page –>
<!– a padding to disable MSIE and Chrome friendly error page –>
<!– a padding to disable MSIE and Chrome friendly error page –>
这是为啥啊？
