Postbox includes a Light and Dark theme, with 22 additional themes available in our "Classic Theme Pack."
How to Install Themes
- Make sure you are running Postbox 7.0.37 or higher.
- Download the Classic Themes Pack and unzip the downloaded file.
- In Postbox, open Preferences | Options > Display > Themes, then click the Import button. Select the theme you wish to install.
Here's a preview of the Classic Theme Pack themes: