goog-mail

Moving to the "searchengine" folder, we find 8 apps, which uses search engines for information gathering. I already checked two (typically the tools can be found in multiple directories, based on their function). The next one is goog-mail.

It's very simple. It takes email addresses from Google search, and it has one argument, which is a domain. Command:

I didn't found it very successful, but it's up to you to decide.