Airmail 3 -- This fully-accessible mail client was specifically designed for iOS, macOS, and watchOS. The email workflow is optimized with many customizations, custom actions, and deep integration with a wide variety of apps and services. Airmail was built from the ground up to provide powerful mail clients that you can customize to your liking. You can integrate your favorite apps and create custom actions to simplify your life. Airmail is available on any device, including your iPhone, iPad, iPhone, or Apple Watch. Airmail can be used to add as many email accounts as you like. (Gmail, GSuite and iCloud Mail, Exchange. Office 365, Microsoft Outlook. IMAP and POP3. The unified inbox feature allows you to see all the email in all your inboxes. This view can be customized to exclude accounts. Smart inbox is for those who only need to see important emails.