Do ISP updates instantly affect all senders?

No, ISP updates do not instantly affect all senders uniformly. Rollouts typically occur gradually, with different senders experiencing changes at different times based on traffic patterns, testing cohorts, and implementation phases.

This gradual rollout explains why some senders notice changes before others. You might experience new filtering before competitors, or vice versa. Early reports from some senders do not guarantee you will see the same effects immediately.

Monitor your own metrics rather than assuming you experience what others report. Changes affecting others may not affect you identically or simultaneously. Your specific characteristics determine when and how updates manifest in your deliverability.