Final answer:
The most frequent security threats delivered through email are Phishing, which deceives recipients into providing sensitive info, and Spam, which may contain malicious content.
Step-by-step explanation:
The security threats that are most often delivered via email are Phishing and Spam.
Phishing attacks involve attackers attempting to trick email recipients into providing sensitive information, such as passwords and credit card numbers, by pretending to be a trustworthy entity. They might also use email to distribute harmful links or attachments that could compromise security.
Spam is unsolicited email that is typically sent out in bulk and can include advertising, but it is also a common delivery method for malicious software and phishing scams.