为什么点击提交都是显示邮箱存在？求助啊！

本来新手很想学PHP 最近编了个注册的程序为什么点击提交时都是显示邮箱被注册 而且数据没有存到数据库中
<?php
$conn=mysql_connect('127.0.0.1','root','');
mysql_select_db('mydb',$conn);

$fuzeren=$_post['fuzeren'];
$rqi=$_post['rqi'];
$mingchen=$_post['mingchen'];
$web=$post_post['web'];
$email=$_post['email'];
$dizhi=$_post['dizhi'];
$guojia=$_post['guojia'];
$dyfxrq=$_post['dyfxrq'];
$jieguo=$_post['jieguo'];
$huixinren=$_post['huixinren'];
$shougrq=$_post['shougrq'];
$zuopmc=$_post['zuopmc'];
$zuoplx=$_post['zuoplx'];
$cunclj=$_post['cunclj'];
$zongtiqk=$_post['zongtiqk'];
$tesuyq=$_post['tesuyq'];
$shiyqk=$_post[shiyqk];
$array=$_post['t1'];

if(isset($_post["username"])){
        $strsql="select * from xiangmu where email='".unescape($_post["email"])."'";
        $result=mysql_query($strsql);
        $rows=@mysql_num_rows($result);
        mysql_close($conn);
        
        //判断是否有此记录
        if($rows){
            echo "已被注册!";
        }else{
            echo "此用户名未被注册!";
        }
    }



else
{
$sql="insert into xiangmu

(idx,fuzeren,rqi,mingchen,web,email,dizhi,guojia,dyfxrq,jieguo,huixinren,shougrq,zuopmc,zuop

lx,cunclj,zongtiqk,tesuyq,shiyqk,shejilx) values

(null,'$fuzeren','$rqi','$mingchen','$web','$email','$dizhi','$guojia','$dyfxrq','$jieguo','

$huixinren','$shougrq','$zuopmc','$zuoplx','$cunclj','$zongtiqk','$tesuyq','$shiyqk','$array

') ";
mysql_query($sql);

echo "<script>alert('信息填写成功!');window.location='guanli.php';</script>";
}

?>

这个代码里没有邮箱的内容，问题点不在这里面