主机是否支持mail（）函数发送

详细解答可以参考官方帮助文档

PHP程序在虚拟主机中可以通过调用fsockopen方式使用SMTP认证邮箱发信，相关程序代码请参考：

<?
echo send_mail('此处为收件人邮箱','发信测试','测试测试测试测试测试测试');

<?

function send_mail($to, $subject = 'No subject', $body) {
        $loc_host = "test";            //发信计算机名，可随意
        $smtp_acc = "

<?

test@hichina.com"; //Smtp认证的用户名，类似fuweng@im286.com，或者fuweng
        $smtp_pass="test";          //Smtp认证的密码，一般等同pop3密码
        $smtp_host="mx.hichina.com";    //SMTP服务器地址，类似 smtp.tom.com
        $from="test@hichina.com";       //发信人Email地址，你的发信信箱地址
    $headers = "Content-Type: text/plain; charset=\"gb2312\"\r\nContent-Transfer-Encoding: base64";
    $lb="\r\n";                    //linebreak
           
        $hdr = explode($lb,$headers);     //解析后的hdr
    if($body) {$bdy = preg_replace("/^\./","..",explode($lb,$body));}//解析后的Body

        $smtp = array(

                //1、EHLO，期待返回220或者250
                array("EHLO ".$loc_host.$lb,"220,250","HELO error: "),
                //2、发送Auth Login，期待返回334
                array("AUTH LOGIN".$lb,"334","AUTH error:"),
                //3、发送经过Base64编码的用户名，期待返回334
                array(base64_encode($smtp_acc).$lb,"334","AUTHENTIFICATION error : "),
                //4、发送经过Base64编码的密码，期待返回235
                array(base64_encode($smtp_pass).$lb,"235","AUTHENTIFICATION error : "));
        //5、发送Mail From，期待返回250
        $smtp[] = array("MAIL FROM: <".$from.">".$lb,"250","MAIL FROM error: ");
        //6、发送Rcpt To。期待返回250
        $smtp[] = array("RCPT TO: <".$to.">".$lb,"250","RCPT TO error: ");
        //7、发送DATA，期待返回354
        $smtp[] = array("DATA".$lb,"354","DATA error: ");
        //8.0、发送From
        $smtp[] = array("From: ".$from.$lb,"","");
        //8.2、发送To
        $smtp[] = array("To: ".$to.$lb,"","");
        //8.1、发送标题
        $smtp[] = array("Subject: ".$subject.$lb,"","");
        //8.3、发送其他Header内容
        foreach($hdr as $h) {$smtp[] = array($h.$lb,"","");}
        //8.4、发送一个空行，结束Header发送
        $smtp[] = array($lb,"","");
        //8.5、发送信件主体
        if($bdy) {foreach($bdy as $b) {$smtp[] = array(base64_encode($b.$lb).$lb,"","");}}
        //9、发送“.”表示信件结束，期待返回250
        $smtp[] = array(".".$lb,"250","DATA(end)error: ");
        //10、发送Quit，退出，期待返回221
        $smtp[] = array("QUIT".$lb,"221","QUIT error: ");

        //打开smtp服务器端口
        $fp = @fsockopen($smtp_host, 25);
        if (!$fp) echo "Error: Cannot conect to ".$smtp_host."
";
        while($result = @fgets($fp, 1024)){if(substr($result,3,1) == " ") { break; }}
       
        $result_str="";
        //发送smtp数组中的命令/数据
        foreach($smtp as $req){
                //发送信息
                @fputs($fp, $req[0]);
                //如果需要接收服务器返回信息，则
                if($req[1]){
                        //接收信息
                        while($result = @fgets($fp, 1024)){
                                if(substr($result,3,1) == " ") { break; }
                        };
                        if (!strstr($req[1],substr($result,0,3))){
                                $result_str.=$req[2].$result."
";
                        }
                }
        }
        //关闭连接
        @fclose($fp);
        return $result_str;
}
?>

以上代码仅供参考，其中调用的smtp邮箱账号和密码以用户实际邮箱账号密码为准

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