If you don’t care about a small amount of detritus left behind, then the easy way to uninstall the program is to simply move the application and its data folder into the trash. Unless you’ve set a custom root path, the program’s data is located at:
/Users/[yourname]/Library/PineappleData
Once you’ve done that, this help topic will help you remove the program’s few remaining traces.
Remove old message files Since it’s possible to drag message files out of the program, they might be scattered all over your hard drives, if you are prone to that kind of activity. Use the Finder to locate all files that end in the pmsg extension and move them to the trash.
Remove prefs files The program has two settings files, which can be found at the following locations:
/Users/[yourname]/Library/Preferences/net.platinumball.PineappleData.plist
/Users/[yourname]/Library/Preferences/net.platinumball.PineappleNews.plist
You should not remove net.platinumball.PineappleData.plist if you are still using Pineapple Mail, because it makes use of some of that file’s settings.
That’s it, you’re done.