The Sender Filtering service has three
individual components: Email Reputation, IP Profiler and SMTP Traffic Throttling.
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Email Reputation filters connections from spam senders when establishing SMTP sessions.
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IP Profiler helps protect the mail server from attacks with smart profiles from the Intrusion Detection Service (IDS).
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SMTP Traffic Throttling blocks messages from a single IP address or sender for a certain time when the number of connections or messages reaches the specified maximum.
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TipTrend Micro recommends deploying Sender Filtering as the first
line of defense in your messaging infrastructure.
Although most email systems have a multi-layer structure that often includes some
pre-existing
IP blocking, spam filtering, and virus filtering, Trend Micro
recommends completely removing other IP blocking techniques from the messaging environment.
Sender Filtering should act as the precursor to any application filtering you might
use.
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NoteSender Filtering is only available from IPv4 networks. Incoming email messages from
IPv6
networks are not blocked by Email Reputation, IP Profiler or SMTP Traffic Throttling.
When email traffic is extremely large, SMTP Traffic Throttling might not precisely
block email
messages as configured due to the time delay between rule trigger and activation.
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