Configure mail notifications by folder class
Remove obsolete "Show unread count" preference
Remove duplicate code. use Utility.hasConnectivity()
Eliminate superclass callbacks
Add support for delete confirmation in message list
Use From or ReplyTo hostname in Message-ID if available
Add privacy pref to omit K-9 User-Agent header
Add preference for setting timezone to UTC
Client certificate authentication
Odds and ends belonging to features just added
Remove ActionSherlock + upgrade build environment to Android 5.0 + random
Use support library for older versions of Android
K9ListActivity