Best of the inbox: the double opt-in that earned MORE money

Best of the inbox: the double opt-in that earned MORE money
The lore says confirmation kills your list. One documented case says the opposite when you measure revenue, not size.

🧪 Tests
— List shrank 18%, revenue per email rose 34% — An affiliate newsletter switched single to double opt-in. They lost 18% of new signups at confirmation but the surviving cohort clicked affiliate links at 2.1x the rate over 90 days. Worth your time: the writeup shows the per-subscriber revenue math, so you can argue it to a boss who only counts headcount.
— The confirmation email itself converted — They added one curated offer to the confirm page; it paid for the opt-in friction within the first send.

Made the cut for separating list size from list value — the distinction most roundups skip.

Saved you ~90 minutes and one bad strategy decision.