It’s one of the cleanest email clients out there today, that supports iCloud (naturally), MS Exchange, Gmail & Google Apps, IMAP/POP3, Yahoo!, and AOL (who still uses that, anyway?). Currently in its 3rd iteration, Airmail is the one client that you can rely on for speed and stability while delivering an experience that matches and improves on the native Mail app in OS X. Of all the email clients that you can find for macOS, Airmail is arguably going to top every list. In this article, we take a look at some of the best third-party macOS email clients that exist today: 1. It’s a pretty capable client that just works, but there are naturally better alternatives. In OS X (now macOS), the native Mail app has been pretty capable, and over the last several years, this is one of those areas of the operating system that has seen consistent improvement.