When i send an email with my contact form the textarea value does not send and the \"message:\" field is always empty in the email.
Declaring the input variables manuall
Your variable naming is inconsistent.
In your HTML-form you're using message for the name-attribute. But in you're AJAX-call and in the PHP $_POST-GLOBAL you are looking for a variable called text.
message
$_POST-GLOBAL
text