There are different ways to prevent harassment. A technique you can use when dealing with persistent harassers of your server is called ban
Ban evasion is simply known as when user is being banned from a site and attempt to get in again. In ban evasion, the said user's account is deleted from the server of the suppose site and their account especially their IP address and phone number are removed from joining the server to hinder ban evasion.
A ban is done so as to hinder or forbid someone from using a particular product or services.
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