Mailspring Alternatives (Email Services) for OS X with FREE

Mailspring is a desktop email client. Mailspring is compatible with Windows, Linux, and MacOS. Mailspring has many features that will attract you to use this like undo message feature allows you to undo a message that you send someone by mistaken. Mailspring allows you to create a custom keyboard shortcut for your fast work. Mailspring also has a pro plan for users who want some extra features like Follow-up reminders, Read receipts, Link tracking, Send later, Company overviews, Snooze messages, Actionable mailbox insights and much more.