Each exclusion removes a massive chunk of the public email landscape:

The exclusion of free webmail forces results toward .edu domains. Raw data dumps from university servers, publicly indexed research collaboration lists, and conference attendee logs from 2019 frequently appear. These are high-authority contacts with significant trust value.

It helps in locating legacy documentation or text-based evidence from specific events in 2019 that might have been preserved on institutional servers.

Based on this intent, a "Feature" to support this workflow would focus on advanced data extraction and filtering. Feature Concept: The "Domain-Aware" Smart Extractor