I helped a friend to find her way to receive again newsletters some times ago. It's when I logged off that I saw the solution: go simply near the end of the page 

https://www.renderosity.com/

There is a "Suscribe to the Newsletter" button. I "resuscribed" to see all the steps for her. Since, I no longer receive the "🌙After Dark🌙" newsletters, but still receive the others. Not that I'll do many with the contentof that specific newsletter, but we never know how things will work with 3D. Anyway, they are no longer in my mailbox: maybe there are no more also and it's the only reason?