Infoga is a tool for gathering e-mail accounts information from different public sources (search engines, pgp key servers). Is a really simple tool, but very effective for the early stages of a penetration test or just to know the visibility of your company in the Internet.
git clone https://github.com/m4ll0k/Infoga.git infoga
cd infoga
pip install -r req
python infoga.py
python infoga.py --target fbi.gov --source all
or
python infoga.py -t fbi.gov -s all
