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IMSS includes optional Sender Filtering, which consists of the following parts:
IP Profiler
Allows you to configure threshold settings used to analyze email traffic. When traffic from an IP address violates the settings, IP Profiler adds the IP address of the sender to its database and then blocks incoming connections from the IP address.
IP profiler detects any of these four potential Internet threats:
  • Spam: Email messages with unwanted advertising content.
  • Viruses: Various virus threats, including Trojan programs.
  • Directory Harvest Attack (DHA): A method used by spammers to collect valid email addresses by generating random email addresses using a combination of random email names with valid domain names. Emails are then sent to these generated email addresses. If an email message is delivered, the email address is determined to be genuine and thus added to the spam databases.
  • Bounced Mail: An attack that uses your mail server to generate email messages that have the target's email domain in the "From" field. Fictitious addresses send email messages and when they return, they flood the target's mail server.
Email Reputation
Blocks email from known spam senders at the IP-level.