Having an issue with jQuery, AJAX and PHP (posting) - php

Question

I am using JQuery and AJAX to post to a PHP file which will eventually parse the data and insert it in a database.
I'm having issue display trying to see what's wrong with my javascript that it will not post the PHP file.
I know it is not posting because I don't recieve and email which is the first function in the PHP file.
JS
$(document).ready(function() {
var ptitle = $("#name").val();
var pdesc = $("#desc").val();
var pemail = $("#email.").val();
$('#submit').click(function() {
sendValue(ptitle, pdesc, pemail);
});
});
function sendValue(ptitle, pdesc, pemail) {
$.post("<?=MOLLY.'update.php'?>", {
stitle: ptitle,
sdesc: pdesc,
semail: pemail
}, function(data) {
//
}, "json");
}
PHP
mail($myemail,'test','test');
if ($_POST){
$title = $_POST['stitle'];
$email = $_POST['semail'];
mail($myemail,$email,$title);
}

Answer 1

You have a typo:
$(document).ready(function() {
var ptitle = $("#name").val();
var pdesc = $("#desc").val();
var pemail = $("#email.").val(); // <---- I assume you meant "#email".
$('#submit').click(function() {
sendValue(ptitle, pdesc, pemail);
});
});

Answer 2

Start by checking that your PHP file runs, replace the content with something like:
PHP
echo "Im running";
Then in your JS do:
$.post("<?=MOLLY.'update.php'?>", function(data) {
console.log(data);
}, "json");
and see if the message is returned and logged in the console.
If it is, check your $_POST by echoing back the values you sent, also echo back your email variable to see that it outputs correctly.
If it all works fine, you need to check if your server is set up correctly for the mail command to actually be able to send an email, as the problem is most likely serverside when everything else is eliminated.
Oh, and you should do what cillosis says, use isset and check something in the $_POST superglobal, not just a if($_POST), but since your running the mail function before that in your PHP, that's probably not your main problem.