Please see this feature request where this behavior was changed from what you're requesting to a system with different dates for each newsletter. Note the accepted answer describes how the arrival date is chosen for your newsletters. Specifically,
Instead, newsletters will be staggered across the workweek on a per-user basis: your first newsletter subscription will arrive on Tuesdays*, your second on Thursdays, third on Mondays, fourth Wednesdays, and fifth on Fridays. Your sixth subscription will loop back to Tuesdays, and so on.