AltaMail allows you to personalise your own mobile mail experience
You can use the "Smart Folders" in the left side panel to view all emails in various groups. View all emails with reminders, flags, actions, unread and saved searches

You can also create your own "Folder Filters" in the left side panel. "Folder Filters" can allow you to view multiple folders in multiple accounts (with unread or flag filtering or other filters) all in a single screen.

You can add Folder Filters to the left side panel using the "Settings" - "Side Menu" settings screen.