BlueMail's Dual Swipe lets you act on emails right from the list. A Short Swipe shows up to three actions in each direction (six in total), and a Long Swipe performs a single action in one motion so you can fly through your inbox.
Short Swipe actions
To add or remove Short Swipe actions, go to Settings | Global Settings | Customize Menus | Configure Left Swipe Menu (or Configure Right Swipe Menu).
Tap the ( + ) icon to add an action, use the drag handle to reorder, and tap X to remove one. You can select up to three actions per direction, and any actions you've already chosen appear grayed out.
Available actions include: Reply Later, Delete, Reply, Reply All, Forward, Done/Undone, Mark as Read/Unread, Move, Star/Unstar, Archive, Spam, and More.
Long Swipe action
The Long Swipe is the action at the top of your selected actions list. To set it, open Configure Left Swipe Menu or Configure Right Swipe Menu and drag the action you want to the top of the list.
To turn Long Swipe off, open the same screen, select Allow Long Swipe – "Action", and untick the checkbox.
Tip: To restore everything to the defaults, go to Settings | Global Settings | Customize Menus | Restore Action Buttons to Default Values.