A common way to attack SMTP is an indirect attack through a DNS server.

Name: A common way to attack SMTP is an indirect attack through a DNS server.
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Question

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DNS servers are often used to store information about mail servers (MX records), which can be exploited by hackers to redirect or spoof email traffic. This is known as DNS spoofing or DNS poisoning, and it can be used to launch phishing attacks or spam campaigns.

A Common Way to Attack SMTP Is an Indirect Attack