Cisco Cisco Email Security Appliance C190 Guia Do Utilizador

Change bare CR and LF characters to CRLF: New feature, converts bare CR and LF characters to 
CRLF characters

Use SenderBase IP Profiling

Timeout for Queries 

SenderBase Timeout per Connection

Maximum Connections

TCP Listen Queue Size (the backlog of connections that AsyncOS will manage before the SMTP 
server accepts them)

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.