Spark now lets you personalize the toolbar with your own favorite email actions and arrange them in any order you like. This is possible with the Spark for iOS 2.5.2 or newer. Some of the actions can also be customized on Android.
Customize the email actions on the toolbar at the bottom and work your way through your emails effortlessly.
Note:You can add up to 6 actions to appear on your toolbar.
Note: The Mark as read/unread , Pin , and Snooze actions always display on the toolbar. To access other actions, tap the More icon .