If you mean email newsletters generally, my own biggest is 172k but I know folks like The Skimm or the Morning Brew run into low millions of subs. A lot of it i

If you mean email newsletters generally, my own biggest is 172k but I know folks like The Skimm or the Morning Brew run into low millions of subs. A lot of it is down to how valuable and targeted the audience is and this guy is clearly winning on that front.