Can filters share intelligence between providers (industry collaboration)?

Filters can share intelligence between providers through industry collaboration and shared resources. Organizations like M3AAWG facilitate information exchange about emerging threats. Shared blocklists aggregate reports from multiple providers into unified reputation databases.

Major providers participate in threat intelligence sharing, exchanging data about active spam campaigns, compromised infrastructure, and emerging attack patterns. This collaboration accelerates response to widespread attacks affecting multiple providers.

However, competitive concerns and privacy considerations limit some sharing. Providers balance collaboration against revealing proprietary filtering techniques. User data underlying reputation systems generally is not shared directly, only aggregated threat intelligence and infrastructure reputation.