How can you measure deliverability drift post-update?

Measuring deliverability drift post update involves tracking metrics over time rather than single point comparisons. Drift refers to gradual changes that accumulate after updates, as opposed to immediate shifts.

Monitor inbox rates, spam rates, bounce rates, and engagement metrics continuously after suspected updates. Plot trends over days and weeks. Gradual deterioration or improvement indicates drift as effects compound over time.

Drift happens because some update effects depend on accumulated data. Changed model weights affect future messages differently as new engagement data accumulates. Initial post update measurements may not capture full effects that emerge over subsequent sending cycles.