FIX: Don't enqueue topics if the user can't create them

Co-authored-by: Vinoth Kannan <vinothkannan@vinkas.com>

lib/email/receiver.rb

@@ -994,6 +994,7 @@ module Email
          end
         raise TooShortPost
       end
+
       raise InvalidPost, errors.join("\n") if result.errors.any?
 
       if result.post