Customers with a new Secure Internet Traffic connection save the fee of CHF 10.–/mo. for 3 e-mail addresses for the first 3 months. All you need is a new or existing inOne SME office subscription. For each additional e-mail address in a domain, CHF 2.–/mo. will be charged from the start of the contract. Mail Security cannot be used to protect specific individual e-mail addresses within the same domain. After the first 3 months, Mail Security costs CHF 10.-/mo. for up to 3 e-mail addresses; each additional e-mail address in the domain costs CHF 2.–/mo. There is a one-off installation cost of CHF 15.–. The subscription can be cancelled at any time to the end of the month.