Cisco Cisco Email Security Appliance C160 사용자 가이드

Chain Queries. You can create a chain query to enable the IronPort appliance 
to perform a series of queries in sequence. When you configure a chain query, 
the IronPort appliance runs each query in sequence until the LDAP appliance 
returns a positive result. 

Directory Harvest Prevention. You can configure the IronPort 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 

. 

SMTP Authentication. AsyncOS provides support for SMTP authentication. 
SMTP Auth is a mechanism for authenticating clients connected to an SMTP 
server. You can use this functionality to enable users at your organization to 
send mail using your mail servers even if they are connecting remotely (e.g. 
from home or while traveling). For more information, see 

External Authentication. You can configure your IronPort appliance to use 
your LDAP directory to authenticate users logging in to the IronPort 
appliance. For more information, see 

Spam Quarantine End-User Authentication. You can configure your 
appliance to validate users when they log in to the end-user quarantine. For 
more information, see 

Spam Quarantine Alias Consolidation. If you use email notifications for 
spam, this query consolidates the end-user aliases so that end-users do not 
receive quarantine notices for each aliased email address. For more 
information, see