Mailbox used to be a popular Gmail and iCloud mail client, yet this app has been shut down by Dropbox in 2016. The Mac version is still available to download as a public beta in mainstream software download sites, like Softpedia and Softonic. If you have accidently installed Mailbox (Beta) for Mac and later found it was ‘dead’, you may go ahead to uninstall this app from your Mac. The question is: how to do it right?
To proper uninstall a third-party app on Mac, you will need to go through these three stages: (1) quit the app if it is currently active, (2) delete it from the /Applications folder, and (3) continue to remove associated items from the hidden system directory.