Cannot use mail account (i.e. email address) previously assigned to deleted user

Cannot use mail account (i.e. email address) previously assigned to deleted user

I created a user in Zoho Business and associated the wrong mail account w/ the user.  So, I deleted the user thinking it would free up the previously created mail account and then tried to create the mail account with correct user, but Zoho now tells me the email already exists.

How can this be corrected?