Creating a new account in Mail on OSX Big Sur (11.2) and complete the required information for: Email Username Password Account type: IMAP Incoming mail server Outgoing mail server I receive a message "Unable to verify account name or password." Note: before you follow these steps, ensure that you know / note down all of your account passwords.  This is because the saved passwords will be deleted during this process. The steps that worked for me: Open the Keychain Access...