Infallibility, serenity, security

Working principle
The MailInBlack anti-spam solution is based on the intelligent principle of authenticating the sender: when an e-mail is sent to a user for the first time, the sender is requested to authenticate himself, thus proving that he is a legitimate sender. Once this procedure has been carried out, the message is dispatched to the recipient and the sender's address is permanently authorized. This secure authentication, which is both simple and rapid, need only be carried out once. This principle is infallible and is adapted to any working case (newsletter, auto-reply, double protected, users, ect...)