When the studio flooded, the metric that mattered wasn't open rate. It was whether people acted.

In December the Bellingham studio flooded. The crisis broke late on a Wednesday. By 7:25 that night the first email was out: class cancellations. Two days later, a studio update. Then the recovery plan — pop-up classes with venues, schedules, and signup links — landed in 4,840 inboxes.
The first send got a 12% open rate, because the people who opened it had already heard and were reading for confirmation. The second hit 30% as the broader audience tuned in. The pop-up invitation produced the highest click count of my entire seven months there.
This is the kind of work that doesn't go in a portfolio for vanity metrics. It goes in for operator judgment under pressure: four sends, each calibrated for the moment, each producing the action the moment required.