Internet security threats/vulnerabilities are divided into passive and active attacks. Examples of passive attacks include network analysis, eavesdropping and traffic analysis. Active attacks include brute force attacks, masquerading, packet replay, message modification, unauthorized access through the Internet or web-based services, denial-of-service attacks, dial-in penetration attacks, email bombing and spamming, and email spoofing. ::EDIT:: Traffic analysis can't be preformed through the email thus there's no right answer. <----- Agreed none of the above. I cant run wireshark through the 'internet' I have to be on your network. I can however, conduct passive information gathering. Just reword the question or delete.