Reading email marketing KPIs in 2026 — open rate is dead, what counts now?
Open rate, CTR, CTOR, conversion rate, engagement score and revenue per email — what Apple MPP and iOS 18 distort and which metrics still hold up.
Martin Rau
KPIs (Marketing)
Übergeordnete Marketing-KPIs — ROI, AOV, LTV/CLV, CAC, MER, Contribution Margin, Share of Search/Voice.