What is backscatter? Attackers often forge the from and reply-to address of an email to send spam messages. When a receiving server receives such email spam with a forged sender address and later realizes that it cannot deliver the email message, it sends a bounce...
Bayesian spam filtering is a statistical technique that is widely used in detecting spam emails. This technique uses features of words contained within an email to detect whether an email is likely to be spam. How does the Bayesian spam filtering technique work? And,...
Spamming is one of the most serious threats today. Every day numerous spam messages are sent by spammers and the objective of these spammers is to make the recipients open the messages, click on a link and buy their products or services. Many times links or...
What is a DNS sinkhole? Let’s say an employee of a company has received one phishing email. He could not recognize the phishing attempt and clicked on the phishing link or opened an attachment to the email. As a result, the employee’s system tries to connect to the...
Every year, millions of users fall victim to phishing attacks. We very often see suspicious messages in our inboxes. For some phishing messages, detection is easier. And, some of the phishing messages are quite difficult to detect. In this article, we will analyze...
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