The NikonRumors email subscription is no longer available. Google decided to kill the service (called Feedburner) I have been using for 15 years. While I am looking for an alternative solution, you can follow the latest NikonRumors blog posts on Facebook, Twitter, and RSS feed:
I assume at some point Google will also kill the Feedburner RSS feed, so it could be a good idea to switch now to the default https://nikonrumors.com/feed.
NikonRumors can also be found on Instagram, YouTube, Flickr, and Pinterest but I am not very active on those channels.