Unable to delete an email account from cPanel

Error Message:

The e-mail address postmaster@mydomain.com deleted successfully.
Sorry, you do not have access to the domain mydomain.com

The error message is displayed when you delete an email account of a domain from cPanel >> Email Accounts that is either shifted under another users account OR usually happens when a domain is swapped from add-on domain to main domain OR vice-versa. In this case, you have to manually remove the email account entries for domain mydomain.com from the existing account.

The files you need to remove the entries from are

/home/user/etc/domainname.tld/passwd
/home/user/etc/domainname.tld/shadow
/home/user/.cpanel/email_accounts.yaml

The directory that need to be removed is

/home/user/mail/mydomain.com

where, user is the one under whos account the email address of mydomain.com exist.