There is an exchange account XYZ. Some people are listed under 'Delivery Options' of this account. These people can send e-mails on behalf of the account XYZ. When any of the people listed under Delivery Options sends an e-mail to the account XYZ, the e-mail goes to a person who is no longer listed under exchange accounts. This person is not a Hidden Recipient either.
Please guide where this recipient could still be sitting and how to remove him.