Kali,

Newsletters typically have a header called List-Unsubscribe. Using the following steps you can configure Xeams to look for this header.

• Go to Filter Management --> Content Filters --> Header Filters and create a new header
• Select Custom Header for Field Name
• Enter List-Unsubscribe:@ for String to search for. Note that the format for a custom header is HeaderName:HeaderValue. 
• Leave the operator as Contains. 

This will look for an '@' sign in a custom header called List-Unsubscribe and assign your desired score