K-9 Mail Locale Plug-in allows Android users to control the behavior of K-9 using the Locale application. K-9 Mail's polling, notifications, new mail ringing and vibrate, and push mail activities can all be controlled, on a global or per-account basis. In addition, K-9's background operations and theme can be controlled.

Use K-9 Mail Locale Plug-in to reduce power consumption during low battery situations, or during times when the phone will not be monitored, such as overnight. Or automatically chose which accounts will be polled at different times of day.