To set preferences in Geary, click the gear menu at the upper right
of the toolbar and choose
When this option is enabled, Geary automatically selects the latest message in a folder when you enter the folder. In addition, after archiving a message, Geary automatically selects an adjacent message.
Enables message previews in the conversation list. Previews show the first few lines of each message.
When set, Geary automatically spell checks a message as you write it, underlying each misspelled word in red.
When set, Geary plays a sound whenever a new message arrives.
When set, Geary displays a notification each time a new message arrives. Notifications are displayed in a system-dependent manner. On GNOME Shell, notifications appear at the bottom of the display. In Ubuntu Unity, notifications appear at the upper right of the display.