How do MBPs share spam data (industry collaboration)?

MBPs share spam intelligence through formal and informal channels. M3AAWG provides structured information sharing among members. Blocklists aggregate and distribute threat data that multiple providers consume. Direct relationships between security teams enable rapid response to emerging campaigns.

Shared data includes: known spam source IPs, malicious URL patterns, phishing campaign signatures, and compromised sender indicators. When Gmail identifies a new phishing campaign, that intelligence can reach other providers through shared feeds and industry channels.

This collaboration means reputation problems propagate. A spam complaint spike at Gmail can trigger blocklist attention that affects Microsoft delivery. Conversely, establishing good reputation with one major provider often helps with others. The ecosystem is more connected than it appears.