InterScan™ Messaging Security Appliance (IMSA) includes IP Filtering, which consists of two parts: IP Profiler and Network Reputation Services (NRS).
IP Profiler allows you to configure threshold settings and determine what action IMSA will take when it detects any of the four potential Internet threats:
Threshold settings—The maximum values that you can set for the various criteria in an IP Filtering rule. For example, the maximum number of recipients, maximum number of mails and so on.
Spam—Email with unwanted advertising content.
Viruses—Various virus threats, including Trojan programs.
Directory Harvest Attack (DHA)—Programs that could add your users' email addresses to spam databases.
Bounced Mail—Email messages returned to you because the messages were sent with your domain in the sender address.
Trend Micro Network Reputation Services (NRS) is designed to identify and block spam before it enters a computer network. NRS does this by routing Internet Protocol (IP) addresses of incoming mail connections to Trend Micro Threat Protection Network for verification against an extensive Reputation Database.
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