Securing Email with Cisco Email Security Appliance (SESA) — Question 82

Spammers routinely try to send emails with the recipient field filled with a list of all possible combinations of letters and numbers. These combinations, appended with a company’s domain name are malicious attempts at learning all possible valid email addresses. Which action must be taken on a Cisco ESA to prevent this from occurring?

Answer options

• A. Quarantine external authentication queries.
• B. Enable end user safelist features.
• C. Perform LDAP acceptance validation.
• D. Select the SMTP Authentication Query checkbox.

Correct answer: C

Explanation

The correct answer is C, as performing LDAP acceptance validation helps ensure that only legitimate email addresses are recognized, blocking spam attempts. The other options do not directly address the issue of spammers trying to guess valid addresses, making them less effective in this scenario.