I have to admit I am not a huge fan of newsletter. I already received enough emails every week.
However, after 10 years of subscription to #TMAI from Avinash Kaushik, it's always a pleasure to read his articles about analytics, marketing and branding. A lot of good common sense with an inspiring touch.
If you want to give it a try, you can subscribe here (the free version is already very good, ad and tracker free).