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Which of the following is not an effective countermeasure against spam?

Which of the following is not an effective countermeasure against spam?

PrepAway - Latest Free Exam Questions & Answers

A.
Open mail relay servers

B.
Properly configured mail relay servers

C.
Filtering on an e-mail gateway

D.
Filtering on the client

Explanation:
A: An open mail relay server is not an effective countermeasure against spam; in fact, spammers often use them to distribute spam, as they allow an attacker to mask their
identity. An open mail relay is an SMTP server that is configured to allow inbound SMTP connections from anyone and to anyone on the Internet. This is how the Internet was
originally set up, but many relays are now properly configured to prevent attackers from using them to distribute spam or pornography.
B is incorrect because a properly configured mail relay server only allows e-mail that is destined and originating from known users to pass through it. In this way, a closed mail
relay server helps prevent the distribution of spam. In order to be considered closed, an SMTP server should be configured to accept and forward messages from local IP
addresses to local mailboxes, from local IP addresses to nonlocal mailboxes, from known and trusted IP addresses to local mailboxes, and from clients that are authenticated
and authorized. Servers that are left open are considered to be the result of poor systems administration.
C is incorrect because implementing spam filters on an e-mail gateway is the most common countermeasure against spam. Doing so helps protect network and server
capacity, reduces the risk of legitimate e-mail being discarded, and saves users time. A number of commercial spam filters based on a variety of algorithms are available. The
filtering software accepts e-mail as its input and either forwards the message unchanged to the recipient, redirects the message for delivery elsewhere, or discards the message.
D is incorrect because filtering on the client is a countermeasure against spam. In fact, filtering can take place at the gateway, which is the most popular method, on the e-mail
server, or on the client. There are also different methods of filtering. Filtering based on keywords was once a popular method but has since become obsolete because it is prone
to false positives and spammers can easily bypass them. Now more sophisticated filters are used. These are based on statistical analysis or analysis of e-mail traffic patterns.

2 Comments on “Which of the following is not an effective countermeasure against spam?

  1. Rolex says:

    Not a good question again, the question is about “not an effective way” which means, is a work around solution, but not the best.
    How come the Answer is A? A is totally not related to the question of “not an effective way”.
    If A is an answer, the question should be “the problem” or “the reason of” spam




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