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

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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?

A.

Select the SMTP Authentication Query checkbox

B.

Perform LDAP acceptance validation.

C.

Quarantine external authentication queries.

D.

Enable end user safelist features

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