High Quality Content by WIKIPEDIA articles! GyazMail is an e-mail client from Japanese developer GyazSquare. It works exclusively on Mac OS X. Targeted toward advanced users, it combines the look-and-feel (integration, appearance…) of an application like Mail (the default e-mail client for Mac OS X) with the power of well-tested applications like Eudora, PowerMail or even Thunderbird. GyazMail is a shareware application.