Provides a safe and smooth way of handling email.It provides a set of advanced features and makes you feel as if you are working with Apple Mail. Though it is not new, but, it has maintained a traditional look and feel of Mac. Postbox 3 is a smart and reliable email client for Mac OS X. Some of the Mac Mail Clients available for Mac OS X are mentioned below. Moreover, it is even harder to choose the best email client from so many different clients. With the availability of so many email clients, Apple Mail and Microsoft Outlook no longer remain stagnant email clients. There are many email clients, which provide advanced features to cater the need of various users. Note: Snow Leopard, Lion, Mountain Lion, Mavericks and Yosemite are popular naming convention for Mac OS X. Current statistics revels that version wise market share of OSX are as follows : These email clients are supported by all versions of Mac OS X. Depending upon the need, a user can choose any email client. However, with the availability of different email clients, users do not have to depend completely on these two. Apple Mail and Microsoft Outlook are the two widely used email clients on Mac systems. Mac users have many choices of using different email clients.