How does certification affect spam filtering?

Certification provides one positive signal among many in filtering decisions. Certified senders may receive: lighter content scrutiny, benefit of doubt on borderline decisions, and reduced throttling during volume spikes. But certification doesn't override other signals.

Filters still evaluate: recipient engagement with this specific sender, content characteristics of this specific message, and real-time reputation indicators. A certified sender with poor engagement or problematic content still faces filtering.

Think of certification as reputation insurance that helps in marginal cases, not as filtering bypass. It supplements good practices rather than substituting for them. Certification without strong fundamentals provides limited benefit.