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Inbound Two-layer Spam Defense
Protection
Known good mail is delivered
What?
Who? When?
Cisco Cisco
Anti-Spam
Talos
Incoming mail: Suspicious mail How? Where?
Good, bad and rate limited and
unknown email spam filtered
Known bad mail is blocked • > 99% catch rate
before it enters the network
• < 1 in 1 million
false positives
