Go to the Finder, hold down the Option key and click the Go menu. You'll see a Library folder in the list. Click that. (You can only see it when you hold down the Option key.)
Click next to the app that you want to delete, then click Delete to confirm. The app is deleted immediately. Apps that don't show either didn't come from the App Store or are required by your Mac. To delete an app that didn't come from the App Store, use the Finder instead. If your Apple Mail doesn't seem to be searchable and/or has become so slow it seems to hang your Mac - or even displays incorrect email content, then it's time you attacked the problem: it's time. To delete all of the app data, you'll need to delete the app from you phone and reinstall it through the app store. To free up storage on your phone, you can also manually clear out data from Messages, Email, Photos, web browsers, and from a few other high data-usage apps. Apple Mail is a system app so, in AppCleaner, try double click on the checkbox and then proceed to Delete the app. Apparently you'll need to do a reinstallation of OSX. According to this Apple page, a reinstallation wont affect your files, can't tell for. 2 days ago My iPhone 7 has been super slow on iOS 14, all versions. Sometimes freezes when I lock it and takes seconds to wake back up. Change macos app icon. I've also had some weird bugs for a long time, both with Messenger and spotify, that haven't gone away even when I've reinstalled the apps. However, after a restore it.
Within, there's a Mail folder, then v2, then subfolders for accounts. Your old account folder may be there, although I've always experienced it being deleted when an account is removed.
Removing an account from Mail does not limit your access to it through webmail. Depending how it was set up, you may have downloaded mail and deleted it from the server, in which case not all messages may be viewable in a browser.
Matt
Mac Pro Delete An App
How to allow apps from other developers on mac. Oct 22, 2013 5:02 AM