The Antivirus protection can be enabled only for the whole hosting account; it cannot be enabled/disabled per mailbox.
To enable/disable the Antivirus protection for all of your mailboxes, follow these steps:
All prices are in USD. No setup fees. Minimum contract period for hosting plans - 1 month. Full prepayment for the contract period. Money‑back guarantee: 15 days for accounts purchased for 1 month and 100 days for accounts on annual billing. Automatic renewal is optional. Fees for domain registrations and SSL certificates cannot be refunded in case of an early contract termination.