The new update adds Smart Folders for enhanced message filtering and organization, VIP contacts, OS X notifications, and support for the "send later" feature available to Gmail and Exchange account holders.
The Mac update also means that Airmail for OS X now syncs account preferences across iPhone and iPad devices, syncing rules, VIP contacts, and Smart Folders over iCloud.
Airmail 3 supports multiple accounts including MS Exchange, Gmail, Google Apps, IMAP, POP3, Yahoo, AOL, Outlook.com, and Live.com.
Other new changes bring options for customizable menus, gestures, keyboard shortcuts, and folders, as well as calendar integration, rules for forwarding messages, Asana and Trello integration, primary inbox support for Gmail, and redesigned message threads.
Airmail 3.0 is available for El Capitan on the Mac App Store, priced at $9.99. [Direct Link]