By default it arrives to the mail of the user who sent the tests, but it is possible to configure a generic mail so that the answers to the mails arrive to this mail. To do this you must enter the menu User => Manage Account Options and enter the email in the Generic Email field. Then in the user configuration (User menu => Configure User) check the option "Use generic email" so that all emails with tests sent by this user when answered will arrive to the generic email configured in the account.