About Dynamic IP Reputation Settings

Trend Micro Email Security makes use of Trend Micro Email Reputation Services (ERS) Standard Service and Advanced Service.

Dynamic IP Reputation Settings use Trend Micro Email Reputation Services Advanced Service, a real-time anti-spam solution. The Trend Micro network of automated expert systems, along with Trend Micro spam experts, continuously monitor network and traffic patterns and immediately update the dynamic IP reputation database as new spam sources emerge, often within minutes. As evidence of spam activity increases or decreases, the dynamic IP reputation database is updated accordingly.

The dynamic IP reputation database includes the following blocking levels:

  • Level 0: Off

    Queries the dynamic reputation database but does not block any IP addresses.

  • Level 1: Least aggressive

    Trend Micro Email Security allows the same amount of spam from a sender with a good rating as in Level 2. The length of time that the IP address stays in the database is generally shorter than for more aggressive settings.

  • Level 2: (the default setting)

    Trend Micro Email Security allows a larger volume of spam from a sender with a good rating than more aggressive settings. However, if an increase in spam above the allowable threshold is detected, it adds the sender to the dynamic reputation database. The length of time that the IP address stays in the database is generally shorter than for more aggressive settings.

  • Level 3:

    Trend Micro Email Security allows a small volume of spam from senders with a good rating. However, if an increase in spam beyond the allowable threshold is detected, it adds the sender to the dynamic reputation database. The length of time that the IP address stays in the database depends on whether additional spam from the sender is detected.

  • Level 4: Most aggressive

    If even a single spam message from a sender IP address is detected, Email Reputation Services adds the sender to the dynamic reputation database and Trend Micro Email Security blocks all messages from the sender. The length of time that the IP address stays in the database depends on whether additional spam from the sender is detected.

If legitimate email is being blocked, select a less aggressive setting. If too much spam is reaching your network, select a more aggressive setting. However, this setting might increase false positives by blocking connections from legitimate email senders.

Note:

To avoid false positives from a trusted partner company, go to Inbound Protection > Connection Filtering > IP Reputation > Approved IP Addresses and add the IP address for their MTA to the Approved list.

The IP addresses in the Approved lists bypass other IP reputation-based filtering. This list is useful for ensuring all messages from a partner company or other MTA are allowed, no matter their status with the standard IP reputation databases or with the Trend Micro Email Reputation Services (ERS) dynamic IP reputation database. When using the IP reputation approved lists, you may experience lower overall spam catch rates.