[php] jQuery AJAX form using mail() PHP script sends email, but POST data from HTML form is undefined

You're using the wrong post parameters:

    var dataString = 'name='+ name + '&email=' + email + '&text=' + text;
                      ^^^^-$_POST['name']
                                       ^^^^--$_POST['name']
                                      etc....

The javascript/html IDs are irrelevant to the actual POST, especially when you're building your own data string and don't use those same IDs.

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