Question

Laura's organization has been receiving a large amount of spam email sent specifically to the email addresses listed in her organization's domain registrations. Which of the following techniques will help her organization limit this type of spam?

A. DNS query rate limiting
B. CAPTCHAs
C. Using a proxy service
D. Blacklisting

Answer 1

Laura's organization can use DNS query rate limiting, CAPTCHAs, and blacklisting to limit spam email it receives.

Step-by-step explanation:

In order to limit spam email sent to an organization's domain registrations, Laura can use the following techniques:

1. DNS query rate limiting: By implementing rate limits on DNS queries, Laura's organization can prevent excessive queries from spam email senders, reducing the amount of spam received.
2. CAPTCHAs: By implementing CAPTCHAs (Completely Automated Public Turing test to tell Computers and Humans Apart), Laura can require users to prove they are human before submitting forms or accessing sensitive information, which can help prevent automated spam bots from sending spam emails.
3. Blacklisting: Laura's organization can create a blacklist of known spam email addresses or domains and block email messages from those sources.