One of the great things about Postbox is the ability to customize the interface to meet your needs. You can take control of the Postbox toolbar and decide to show or hide buttons that you may or may not use every day. Toolbars of main Postbox window, compose window, and address book window can all be customized.
Adding and removing buttons on the toolbar is as easy as drag and drop. In order to see the available buttons, go to View | Customize Toolbar... or simply right-click on the toolbar itself. In the window that appears, simply drag any button into the desired location in the toolbar. To remove a button, just drag it down into the window. Spaces and Flexible Spaces and Separators are available to assist in organization.