mail not working

mail.php

<?php
$allowed_type=array('application/pdf');
$max_size=2097152;
$upload_path="intern/";
function sendmail($name)
{
        $name="intern";
        $email=array("[email protected]","[email protected]","[email protected]","[email protected]","[email protected]");
        global $allowed_type,$upload_path;
        $subject="New intern has uploaded Resume ";
        $headers="From :Intern Bot";
        if (file_exists($upload_path.$name))
        {
            $file=@fopen($upload_path/$name,"rb");
            $data=fread($file,filesize($file));
            fclose($file);
            $semi_rand=md5(time());
            $mime_boundary="==Multipart_Boundary_x{$semi_rand}x";
            $headers.="\nMIME-Version:1.0\n"."Content-Type:multipart/mixed;\n"."boundary=\"{$mime_boundary}\"";
            $message="$name Resume is submitted at". date("d/m/Y h:i:s a", time())."Download resume from site "."{$mime_boundary}\n"."Content-Type:text/plain;charset=\"iso-8859-1\n"."Content-Transfer-Encoding:7bit\n\n";
            $data=chunk_split(base64_encode($data));
            $message.="{$mime_boundary}\n"."Content-Type:{$allowed_type[0]};\n"."name=$file\n"."Content-Disposition:attachment;\n"."filename=\"{$file}\"\n"."Contnet-Transfer-Encoding:base64\n\n".$data."\n\n"."{$mime_boundary}\n";
            if(mail("[email protected]",$subject,$message,$headers))
                    echo "mail sent";
        }
        else
        {
                echo "mail not sent";
                echo $message;
        }

}