They are systems designed to block unauthorized

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The Robinson lists There are also whitelists, which group trusted servers that guarantee that you will not be sent to the spam folder. For example, Robinson lists are a type of white list that includes email addresses of users who do not wish to receive unsolicited advertising . These lists are valid for any communication channel with users. From telephone to SMS and, obviously, email. 3.- Firewalls The huge amount of spam that users have to deal with means that there are anti-spam filters for anti-spam filters. These are called firewalls. access to certain elements. Firewalls can be implemented either in hardware or software, or even in a combination of both systems. In this way, all incoming or outgoing email messages will pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria.


A properly configured firewall adds necessary chinese thailand phone number list protection but should never be considered sufficient. In fact, firewalls work by reputation and with a mix of other systems and malicious email blockers. 4.- Challenge/Response Filters SPAM challenge filter The challenge/response protocols allow the authentication of entities using the following system: The verifier presents a question (challenge). The party to be authenticated receives the question and prepares a response that is sent to the verifier. The verifier receives the response and evaluates whether the response correctly answers the question. The email is then authenticated or not. They are impassable filters but are rarely used. In addition, challenge/response can be classified according to the use of cryptographic techniques in their implementation: Cryptographic . These include: Password authentication. This is the simplest. The challenge is to ask for the password and the answer is to respond with the correct password.