We have listed 14 alternatives for Airmail which have similar features like
Airmail
including commercial, freemium, free and open source Windows
alternatives.
The Bat! is an email program for Windows that protects the correspondence and empowers the users to handle large amounts of emails quickly and efficiently.
Kontact is a personal information manager and groupware software suite developed by KDE. It supports calendars, contacts, notes, to-do lists, news, and email.