On Mac OS X 10.0 or later, Apple Mail or Mac Mail is the default e-mail client application. Using this e-mail application, one can access their e-mail account securely. But, some users have encountered an error while verifying their accounts. In most cases, errors occur due to wrong account credentials entered during the account setup process. To solve the ‘Mac mail outlook unable to verify’ issue, try some of the suggestions mentioned below.
You can remove the e-mail account in two ways.
From the Mail app