Refer to the exhibit.

In TAP reporting and weekly dashboard metrics, “blocked at the email gateway” represents messages prevented from reaching user mailboxes by the Proofpoint email security layer (pre-delivery containment). The highlighted week’s gateway-blocked malicious count in the exhibit corresponds to 132,537 (C), which reflects the volume of threats stopped before user exposure—an important operational metric for prevention effectiveness. In Proofpoint-focused IR, analysts use this metric to distinguish between (1) threats fully contained pre-delivery (lower immediate response burden) and (2) threats delivered or interacted with (higher incident risk requiring containment and user remediation). High gateway-blocked numbers can still indicate an active campaign targeting the organization and may justify proactive measures: tightening policy thresholds, reviewing top senders/domains, and validating that URL/attachment defenses are functioning as expected. It also supports post-incident reporting by showing “prevented impact” and helping stakeholders understand defense value. For detection and analysis, the key is correlating this figure with At Risk/Impacted trends; a high blocked count with low impacted is a healthy posture, while any spike in impacted warrants immediate investigation.