Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

To access the LDAP options, expand the section by clicking on LDAP Options in 
the listing. 

The LDAP options settings for listeners are used to enable LDAP queries on the 
listener. You must create the LDAP query first, before using this option. Each type 
of query (Accept, Routing, Masquerade, Group) has a separate subsection. Click 
the type of query to expand the subsection.

For more information about creating LDAP queries, see 

For Accept queries, select the query to use from the list. You can specify whether 
the LDAP Accept occurs during the work queue processing or during the SMTP 
conversation.

For LDAP Accept during the work queue processing, specify the behavior for 
non-matching recipients: bounce or drop.

For LDAP Accept during the SMTP conversation, specify how to handle mail if 
the LDAP server is unreachable. You can elect to allow messages or drop the 
connection with a code and custom response. Finally, select whether or not to drop 
connections if the Directory Harvest Attack Prevention (DHAP) threshold is 
reached during an SMTP conversation.

Performing recipient validation in the SMTP conversation can potentially reduce 
the latency between multiple LDAP queries. Therefore, you might notice an 
increased load on your directory server when you enable conversational LDAP 
Accept.