What Dan Oshinsky of Inbox Collective taught me about the third big wave in email history, why depth beats everything in an AI-filtered inbox, and the fundamentals that matter more now, not less.

Machine opens, "human" opens, and the 2-Minute Rule that exposes them all.

The biggest change I've made to my sending segment in over a year.

Most publishers track subscribers and revenue. The best publishers track RPES, CPES, Activation Rate, and Subscriber Churn.

Podcasts obsess over attention. Email still obsesses over opens. In 2026, that gap is starting to cost publishers real money.

Why suppression, sunset policies, and list discipline are often the fastest path to better deliverability and higher revenue.