Mailpile is a free, open source e-mail client for Mac, Windows, and Linux operating systems that aims to provide users with unprecedented control over their e-mails. Unlike popular online e-mail clients, Mailpile prioritizes the safety, security, and privacy of its users' communications. By utilizing OpenPGP signatures and encryption, it ensures that your correspondence remains private, even in the event of your computer being stolen. Furthermore, Mailpile allows users to host the client on their own laptop or desktop, eliminating the presence of ads. With its fast speeds and powerful internal search capabilities, Mailpile stands out as one of the most transparent and open e-mail clients on the market.