wordpress advantage a 404 when i call php record with jquery ajax

I have php record for adding email addresses to a newslistthe record is in
my wp-content/plugins directorymy record is called add_subscriber.phpi
cruise my htaccess retard this record for some reasonmy htaccess record is
as followIndexIgnore .htaccess */.??* *~ *# */HEADER* */README*
*/_vti*order deny,allowdeny from allallow from allorder deny,allowdeny
from allRewriteEngine OnRewriteBase /RewriteRule ^index\.php$ -
[L]RewriteCond %{REQUEST_FILENAME} !-fRewriteCond %{REQUEST_FILENAME}
!-dRewriteRule . /index.php [L]when i try to call this record it somehow
redirects to a 404 page.my AJAX code <?php relate 'var blog_url =
\''.get_bloginfo('wpurl').'\''; ?>;function validateEmail(email) { var
re =
/^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
relapse re.test(email);}function subscribeMailList(){
email=jQuery("#ml-email").val(); if(!validateEmail(email)){
relapse false; } //jQuery("#ml-").fadeIn(0); //jquery ajax ask
var url=blog_url+"/wp-content/plugins/mail-list/ajax/add_subscriber.php"
console.log(url);
jQuery.post(url,{emailaddress:email},function(result){
if(result=="true"){
$("#newsletter-form-succeeded").css("display","block");
$("#newsletter-form").css("display","none"); } });
//hide a form /*jQuery("#ml-").fadeOut(0);
jQuery('#ml-p').fadeOut(0); jQuery('#ml-p-sent').fadeIn(0);
jQuery('#ml-form').fadeOut(0);
jQuery('#ml-newsletterform').delay(3000).fadeOut(1000);*/ relapse
false;}