Deliverability problems usually surface as a slow bleed in open rates. Winter '27 gives you an early warning system instead.
Where
The new deliverability monitoring dashboard in Marketing Cloud Next.
How
The feature monitors email performance across mailbox providers and message types and assigns a health score from 0 to 100. When critical thresholds are reached, automated alerts fire so you hear about it before your campaign metrics do.
Why
Sender reputation issues are much cheaper to fix early. A single score plus alerts turns deliverability from a quarterly audit into continuous monitoring.