不使用smtp直接发送邮件

C:\>nslookup
默认服务器:  google-public-dns-a.google.com
Address:  8.8.8.8
> set type=mx
> qq.com
服务器:  google-public-dns-a.google.com
Address:  8.8.8.8
非权威应答:
qq.com  MX preference = 10, mail exchanger = mx3.qq.com
qq.com  MX preference = 20, mail exchanger = mx2.qq.com
qq.com  MX preference = 30, mail exchanger = mx1.qq.com
C:\>telnet mx3.qq.com 25
220 newmx13.qq.com MX QQ Mail Server
HELO localhost
250 newmx13.qq.com
MAIL FROM:<eslizn@localhost>
250 Ok
RCPT TO:<10000@qq.com>
250 Ok
DATA
354 End data with <CR><LF>.<CR><LF>
hello!
.
550 Mail content denied. //service.mail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000726
QUIT

function realmail($to,$subject,$message,$from,$type="text/plain"){
    $rule="/([a-zA-Z0-9-.]+)\@([a-zA-Z0-9-.]+)/i";
    if(!pregmatch($rule,$to,$to) || !pregmatch($rule,$from,$from)){
        return false;
    }
    if (!getmxrr($to[2],$mx)){
        return false;
    }
    $message = array(
        "MIME-Version: 1.0",
        "X-Mailer: Xmailer",
        "Delivered-To: {$to[0]}",
        "From: {$from[1]} <{$from[0]}>",
        "To: {$to[1]} <{$to[0]}>",
        "Date: ".date("D, t F Y H:i:s O"),
        "Content-Type: {$type}; charset=UTF-8",
        "Content-Transfer-Encoding: base64",
        "Subject: =?UTF-8?B?".base64encode($subject)."?=",
        "",
        base64encode($message)
    );
    $cmds=array(
        "HELO {$from[2]}",
        "MAIL FROM:<{$from[0]}>",
        "RCPT TO:<{$to[0]}>",
        "DATA",
        implode("\r\n",$message)."\r\n.\r\n",
        "QUIT"
    );
    $fp=fsockopen(current($mx),25);
    foreach($cmds as $val){
        fwrite($fp,$val."\r\n");
        fgets($fp);
    }
    fclose($fp);
    return true;
}