You could use Calibre and import a custom "recipe".
https://www.mobileread.com/forums/showthread.php?t=32543
Not sure if the Post is available yet, but you can make a request for it.
I got my local paper added and read it every morning now on my Sony, but it could work on my Kindle, too.
You can pick which feeds you would want included in a custom recipe by going here:
http://www.nypost.com/Rss