This anti-spam is based on sender authentication How does it work? When an unknown sender writes to you for the first time, Emjysoft Anti-Spam will send him an e-mail asking him to authenticate himself. After successful authentication, you will receive their emails directly. The sender authenticates himself directly by e-mail without going through a third party server or an external website. Since the authentication of the correspondents is done by e-mail and not via third-party services, the confidentiality of your e-mails is assured since they never leave your mailbox! Emjysoft Anti-Spam v2023 is free in its basic version. However, it is limited to 3 mailboxes and 20 whitelisted emails. The premium version has no limit! Administrator rights required for installation