Rowan Cheung shares five lessons from growing The Rundown newsletter

Rowan Cheung says The Rundown has reached 3.5 million total active subscribers with an open rate above 55%.

In a post on X, he lists five lessons from its growth, including treating email as its own platform, running onboarding experiments, keeping operations lean, and educating advertisers so newsletter sales are booked months in advance.

The figures and the lessons are Cheung's own account. The post does not include data on how the subscriber count or open rate was measured.