Spammers routinely try to send emails with the recipient field filled with a list of...

Vendor: Cisco
Product: 300-720
Update on: Apr 21, 2026
Questions: 190

Cisco 300-720 Question Answer

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 domain name are malicious attempts at learning all possible valid email addresses. Which action must be taken on a Cisco Secure Email Gateway to prevent this from occurring?

Select the SMTP Authentication Query checkbox

Perform LDAP acceptance validation.

Quarantine external authentication queries.

Enable end user safelist features