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?

A. Quarantine external authentication queries.

B. Enable end user safelist features.

C. Perform LDAP acceptance validation.

D. Select the SMTP Authentication Query checkbox.








 

Suggested Answer: C



This question is in 300-720 Securing Email with Cisco Email Security Appliance (SESA) Exam
For getting Cisco Certified Network Professional Security (CCNP Security) Certificate




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