Cisco Cisco Email Security Appliance C670 ユーザーガイド
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7-5
Cisco IronPort AsyncOS 7.5 for Email Configuration Guide
OL-25136-01
Chapter 7 Reputation Filtering
Figure 7-1
The SenderBase Reputation Service
Step 1
SenderBase affiliates send real-time, global data
Step 2
Sending MTA opens connection with the Cisco IronPort appliance
Step 3
Cisco IronPort appliance checks global data for the connecting IP address
Step 4
SenderBase Reputation Service calculates the probability this message is spam
and assigns a SenderBase Reputations Score
and assigns a SenderBase Reputations Score
Step 5
Cisco IronPort returns the response based on the SenderBase Reputation Score
Sending MTA
SBRS Scoring Engine
•Global complaint data
•Global volume data
SenderBase Affiliate Network
1
5
3
4
2
1.2.3.4
HELO
1.2.3.4
Rule hits
SBRS =
x.x
250-Recipient Accepted
or
452-Too many recipients this hour
or
554-Access Denied
for
1.2.3.4
IronPort appliance