Without receiving emails

Without receiving emails

 
Dear, Good afternoon!
I am an Enterprise Technology, administer e- mails An Institution Librapred - Condominium Management . A trainee tried to set up e- mails Company in Zoho Mail, and had already set up for Google Apps and now he forgot the administrator password (suporte@librapred.com.br), I want to delete the created accounts. Please how to proceed in this situation , the company's employees are not receiving e- mails.
Looking forward , thanks.