GyazMail

GyazMail is a full-featured email client for macOS, designed as an alternative to the system Mail app. Built from the ground up on the Cocoa framework, it offers a clean, easy-to-use interface alongside advanced features such as customisable account management, spam filtering, multiple message filtering rules, and flexible message organisation. The app supports standard email protocols (IMAP, POP, SMTP) and allows users to manage multiple email accounts from a single window. GyazMail is distributed as shareware with a 40-day free trial period, and is still under active development with regular updates.