Key rotation replaces old DKIM keys with new ones on a schedule to reduce long-term risk.
Key Rotation is the process of updating DKIM keys periodically. It reduces risk if keys are exposed and aligns with good security hygiene. The safe way is to publish a new selector, start signing with it, and keep the old selector active for a while so older messages still validate. For email platforms, guiding users through rotation helps prevent unexpected authentication failures.