Mail Pilot is a polished email client for macOS that delivers simple yet powerful function plus a modern user interface. The client takes a simplified approach to email client software, unlike traditional ones that use flags and complicated settings.
Mail Pilot allows you to send emails from all accounts to several different places. In other words, you can sort messages across all your accounts into a number of special folders. Various email services, including GMail, iCloud, AOL, Yahoo! or Outlook, as well as all standard types of IMAP email accounts are supported
Organize emails based on status
Send messages to lists
Set aside emails for later
Simple keyboard shortcuts
OS X Notification Center support