A network administrator notices that there are a high number of queries to the LDAP server. The mail logs show an entry “550 Too many invalid recipients | Connection closed by foreign host.”
A is Correct.
Directory Harvest Prevention. You can configure the appliance to combat directory harvest attacks using your LDAP directories. You can configure directory harvest prevention during the SMTP conversation or within the work queue. If the recipient is not found in the LDAP directory, you can configure the system to perform a delayed bounce or drop the message entirely. Consequently, spammers are not able to differentiate between valid and invalid email addresses. See Using LDAP For Directory Harvest Attack Prevention.
https://www.cisco.com/c/en/us/td/docs/security/esa/esa11-1/user_guide/b_ESA_Admin_Guide_11_1/b_ESA_Admin_Guide_chapter_011010.html?bookSearch=true
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